diff --git a/CHANGELOG.md b/CHANGELOG.md
index f0c9dcfe094..290700b4f88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -43,6 +43,11 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### API Breaking
 
+<<<<<<< HEAD
+=======
+* (modules/core/03-connection) [\#1672](https://github.com/cosmos/ibc-go/pull/1672) Remove crossing hellos from connection handshakes. The `PreviousConnectionId` in `MsgConnectionOpenTry` has been deprecated.
+* (modules/core/04-channel) [\#1317](https://github.com/cosmos/ibc-go/pull/1317) Remove crossing hellos from channel handshakes. The `PreviousChannelId` in `MsgChannelOpenTry` has been deprecated.  
+>>>>>>> 9aab42d (refactor: remove crossing hellos from 03-connection (#1672))
 * (transfer) [\#1250](https://github.com/cosmos/ibc-go/pull/1250) Deprecate `GetTransferAccount` since the `transfer` module account is never used.
 * (channel) [\#1283](https://github.com/cosmos/ibc-go/pull/1283) The `OnChanOpenInit` application callback now returns a version string in line with the latest [spec changes](https://github.com/cosmos/ibc/pull/629).  
 * (modules/29-fee)[\#1338](https://github.com/cosmos/ibc-go/pull/1338) Renaming `Result` field in `IncentivizedAcknowledgement` to `AppAcknowledgement`.
diff --git a/docs/ibc/proto-docs.md b/docs/ibc/proto-docs.md
index 30c6d350bd1..8f3ec0db19d 100644
--- a/docs/ibc/proto-docs.md
+++ b/docs/ibc/proto-docs.md
@@ -4244,7 +4244,7 @@ connection on Chain B.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | `client_id` | [string](#string) |  |  |
-| `previous_connection_id` | [string](#string) |  | in the case of crossing hello's, when both chains call OpenInit, we need the connection identifier of the previous connection in state INIT |
+| `previous_connection_id` | [string](#string) |  | **Deprecated.** Deprecated: this field is unused. Crossing hellos are no longer supported in core IBC. |
 | `client_state` | [google.protobuf.Any](#google.protobuf.Any) |  |  |
 | `counterparty` | [Counterparty](#ibc.core.connection.v1.Counterparty) |  |  |
 | `delay_period` | [uint64](#uint64) |  |  |
diff --git a/docs/migrations/v3-to-v4.md b/docs/migrations/v3-to-v4.md
index 903c027ce4b..8314775197f 100644
--- a/docs/migrations/v3-to-v4.md
+++ b/docs/migrations/v3-to-v4.md
@@ -18,6 +18,18 @@ No genesis or in-place migrations required when upgrading from v1 or v2 of ibc-g
 
 ## Chains
 
+<<<<<<< HEAD
+=======
+- No relevant changes were made in this release.
+
+## IBC Apps
+
+### ICS03 - Connection
+
+Crossing hellos have been removed from 03-connection handshake negotiation. 
+`PreviousConnectionId` in `MsgConnectionOpenTry` has been deprecated and is no longer used by core IBC.
+
+>>>>>>> 9aab42d (refactor: remove crossing hellos from 03-connection (#1672))
 ### ICS04 - Channel 
 
 The `WriteAcknowledgement` API now takes the `exported.Acknowledgement` type instead of passing in the acknowledgement byte array directly. 
@@ -91,3 +103,8 @@ if err := k.icaControllerKeeper.RegisterInterchainAccount(ctx, msg.ConnectionId,
 ## Relayers
 
 When using the `DenomTrace` gRPC, the full IBC denomination with the `ibc/` prefix may now be passed in.
+<<<<<<< HEAD
+=======
+
+Crossing hellos are no longer supported by core IBC for 03-connection and 04-channel. The handshake should be completed in the logical 4 step process (INIT, TRY, ACK, CONFIRM).
+>>>>>>> 9aab42d (refactor: remove crossing hellos from 03-connection (#1672))
diff --git a/modules/core/03-connection/keeper/handshake.go b/modules/core/03-connection/keeper/handshake.go
index 9f809a47a25..faca5c0f74c 100644
--- a/modules/core/03-connection/keeper/handshake.go
+++ b/modules/core/03-connection/keeper/handshake.go
@@ -1,12 +1,9 @@
 package keeper
 
 import (
-	"bytes"
-
 	"github.com/cosmos/cosmos-sdk/telemetry"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
-	"github.com/gogo/protobuf/proto"
 
 	clienttypes "github.com/cosmos/ibc-go/v4/modules/core/02-client/types"
 	"github.com/cosmos/ibc-go/v4/modules/core/03-connection/types"
@@ -28,7 +25,7 @@ func (k Keeper) ConnOpenInit(
 ) (string, error) {
 	versions := types.GetCompatibleVersions()
 	if version != nil {
-		if !types.IsSupportedVersion(version) {
+		if !types.IsSupportedVersion(types.GetCompatibleVersions(), version) {
 			return "", sdkerrors.Wrap(types.ErrInvalidVersion, "version is not supported")
 		}
 
@@ -63,7 +60,6 @@ func (k Keeper) ConnOpenInit(
 //  - Identifiers are checked on msg validation
 func (k Keeper) ConnOpenTry(
 	ctx sdk.Context,
-	previousConnectionID string, // previousIdentifier
 	counterparty types.Counterparty, // counterpartyConnectionIdentifier, counterpartyPrefix and counterpartyClientIdentifier
 	delayPeriod uint64,
 	clientID string, // clientID of chainA
@@ -75,44 +71,9 @@ func (k Keeper) ConnOpenTry(
 	proofHeight exported.Height, // height at which relayer constructs proof of A storing connectionEnd in state
 	consensusHeight exported.Height, // latest height of chain B which chain A has stored in its chain B client
 ) (string, error) {
-	var (
-		connectionID       string
-		previousConnection types.ConnectionEnd
-		found              bool
-	)
-
-	// empty connection identifier indicates continuing a previous connection handshake
-	if previousConnectionID != "" {
-		// ensure that the previous connection exists
-		previousConnection, found = k.GetConnection(ctx, previousConnectionID)
-		if !found {
-			return "", sdkerrors.Wrapf(types.ErrConnectionNotFound, "previous connection does not exist for supplied previous connectionID %s", previousConnectionID)
-		}
-
-		// ensure that the existing connection's
-		// counterparty is chainA and connection is on INIT stage.
-		// Check that existing connection versions for initialized connection is equal to compatible
-		// versions for this chain.
-		// ensure that existing connection's delay period is the same as desired delay period.
-		if !(previousConnection.Counterparty.ConnectionId == "" &&
-			bytes.Equal(previousConnection.Counterparty.Prefix.Bytes(), counterparty.Prefix.Bytes()) &&
-			previousConnection.ClientId == clientID &&
-			previousConnection.Counterparty.ClientId == counterparty.ClientId &&
-			previousConnection.DelayPeriod == delayPeriod) {
-			return "", sdkerrors.Wrap(types.ErrInvalidConnection, "connection fields mismatch previous connection fields")
-		}
 
-		if !(previousConnection.State == types.INIT) {
-			return "", sdkerrors.Wrapf(types.ErrInvalidConnectionState, "previous connection state is in state %s, expected INIT", previousConnection.State)
-		}
-
-		// continue with previous connection
-		connectionID = previousConnectionID
-
-	} else {
-		// generate a new connection
-		connectionID = k.GenerateConnectionIdentifier(ctx)
-	}
+	// generate a new connection
+	connectionID := k.GenerateConnectionIdentifier(ctx)
 
 	selfHeight := clienttypes.GetSelfHeight(ctx)
 	if consensusHeight.GTE(selfHeight) {
@@ -139,15 +100,10 @@ func (k Keeper) ConnOpenTry(
 	expectedCounterparty := types.NewCounterparty(clientID, "", commitmenttypes.NewMerklePrefix(prefix.Bytes()))
 	expectedConnection := types.NewConnectionEnd(types.INIT, counterparty.ClientId, expectedCounterparty, types.ExportedVersionsToProto(counterpartyVersions), delayPeriod)
 
-	supportedVersions := types.GetCompatibleVersions()
-	if len(previousConnection.Versions) != 0 {
-		supportedVersions = previousConnection.GetVersions()
-	}
-
 	// chain B picks a version from Chain A's available versions that is compatible
 	// with Chain B's supported IBC versions. PickVersion will select the intersection
 	// of the supported versions and the counterparty versions.
-	version, err := types.PickVersion(supportedVersions, counterpartyVersions)
+	version, err := types.PickVersion(types.GetCompatibleVersions(), counterpartyVersions)
 	if err != nil {
 		return "", err
 	}
@@ -181,7 +137,7 @@ func (k Keeper) ConnOpenTry(
 	}
 
 	k.SetConnection(ctx, connectionID, connection)
-	k.Logger(ctx).Info("connection state updated", "connection-id", connectionID, "previous-state", previousConnection.State.String(), "new-state", "TRYOPEN")
+	k.Logger(ctx).Info("connection state updated", "connection-id", connectionID, "previous-state", "NONE", "new-state", "TRYOPEN")
 
 	defer func() {
 		telemetry.IncrCounter(1, "ibc", "connection", "open-try")
@@ -223,28 +179,19 @@ func (k Keeper) ConnOpenAck(
 		return sdkerrors.Wrap(types.ErrConnectionNotFound, connectionID)
 	}
 
-	// Verify the provided version against the previously set connection state
-	switch {
-	// connection on ChainA must be in INIT or TRYOPEN
-	case connection.State != types.INIT && connection.State != types.TRYOPEN:
-		return sdkerrors.Wrapf(
-			types.ErrInvalidConnectionState,
-			"connection state is not INIT or TRYOPEN (got %s)", connection.State.String(),
-		)
-
-	// if the connection is INIT then the provided version must be supproted
-	case connection.State == types.INIT && !types.IsSupportedVersion(version):
+	// verify the previously set connection state
+	if connection.State != types.INIT {
 		return sdkerrors.Wrapf(
 			types.ErrInvalidConnectionState,
-			"connection state is in INIT but the provided version is not supported %s", version,
+			"connection state is not INIT (got %s)", connection.State.String(),
 		)
+	}
 
-	// if the connection is in TRYOPEN then the version must be the only set version in the
-	// retreived connection state.
-	case connection.State == types.TRYOPEN && (len(connection.Versions) != 1 || !proto.Equal(connection.Versions[0], version)):
+	// ensure selected version is supported
+	if !types.IsSupportedVersion(types.ProtoVersionsToExported(connection.Versions), version) {
 		return sdkerrors.Wrapf(
 			types.ErrInvalidConnectionState,
-			"connection state is in TRYOPEN but the provided version (%s) is not set in the previous connection versions %s", version, connection.Versions,
+			"the counterparty selected version %s is not supported by versions selected on INIT", version,
 		)
 	}
 
@@ -283,7 +230,7 @@ func (k Keeper) ConnOpenAck(
 		return err
 	}
 
-	k.Logger(ctx).Info("connection state updated", "connection-id", connectionID, "previous-state", connection.State.String(), "new-state", "OPEN")
+	k.Logger(ctx).Info("connection state updated", "connection-id", connectionID, "previous-state", "INIT", "new-state", "OPEN")
 
 	defer func() {
 		telemetry.IncrCounter(1, "ibc", "connection", "open-ack")
diff --git a/modules/core/03-connection/keeper/handshake_test.go b/modules/core/03-connection/keeper/handshake_test.go
index 5f322e4e213..d82a2cf22f5 100644
--- a/modules/core/03-connection/keeper/handshake_test.go
+++ b/modules/core/03-connection/keeper/handshake_test.go
@@ -80,12 +80,11 @@ func (suite *KeeperTestSuite) TestConnOpenInit() {
 // connection on chainA is INIT
 func (suite *KeeperTestSuite) TestConnOpenTry() {
 	var (
-		path                 *ibctesting.Path
-		delayPeriod          uint64
-		previousConnectionID string
-		versions             []exported.Version
-		consensusHeight      exported.Height
-		counterpartyClient   exported.ClientState
+		path               *ibctesting.Path
+		delayPeriod        uint64
+		versions           []exported.Version
+		consensusHeight    exported.Height
+		counterpartyClient exported.ClientState
 	)
 
 	testCases := []struct {
@@ -100,15 +99,6 @@ func (suite *KeeperTestSuite) TestConnOpenTry() {
 			// retrieve client state of chainA to pass as counterpartyClient
 			counterpartyClient = suite.chainA.GetClientState(path.EndpointA.ClientID)
 		}, true},
-		{"success with crossing hellos", func() {
-			err := suite.coordinator.ConnOpenInitOnBothChains(path)
-			suite.Require().NoError(err)
-
-			// retrieve client state of chainA to pass as counterpartyClient
-			counterpartyClient = suite.chainA.GetClientState(path.EndpointA.ClientID)
-
-			previousConnectionID = path.EndpointB.ConnectionID
-		}, true},
 		{"success with delay period", func() {
 			err := path.EndpointA.ConnOpenInit()
 			suite.Require().NoError(err)
@@ -227,8 +217,6 @@ func (suite *KeeperTestSuite) TestConnOpenTry() {
 
 			// retrieve client state of chainA to pass as counterpartyClient
 			counterpartyClient = suite.chainA.GetClientState(path.EndpointA.ClientID)
-
-			previousConnectionID = path.EndpointB.ConnectionID
 		}, false},
 		{"invalid previous connection has invalid versions", func() {
 			// open init chainA
@@ -253,8 +241,6 @@ func (suite *KeeperTestSuite) TestConnOpenTry() {
 
 			// retrieve client state of chainA to pass as counterpartyClient
 			counterpartyClient = suite.chainA.GetClientState(path.EndpointA.ClientID)
-
-			previousConnectionID = path.EndpointB.ConnectionID
 		}, false},
 	}
 
@@ -265,7 +251,6 @@ func (suite *KeeperTestSuite) TestConnOpenTry() {
 			suite.SetupTest()                          // reset
 			consensusHeight = clienttypes.ZeroHeight() // must be explicitly changed in malleate
 			versions = types.GetCompatibleVersions()   // must be explicitly changed in malleate
-			previousConnectionID = ""
 			path = ibctesting.NewPath(suite.chainA, suite.chainB)
 			suite.coordinator.SetupClients(path)
 
@@ -292,7 +277,7 @@ func (suite *KeeperTestSuite) TestConnOpenTry() {
 			proofClient, _ := suite.chainA.QueryProof(clientKey)
 
 			connectionID, err := suite.chainB.App.GetIBCKeeper().ConnectionKeeper.ConnOpenTry(
-				suite.chainB.GetContext(), previousConnectionID, counterparty, delayPeriod, path.EndpointB.ClientID, counterpartyClient,
+				suite.chainB.GetContext(), counterparty, delayPeriod, path.EndpointB.ClientID, counterpartyClient,
 				versions, proofInit, proofClient, proofConsensus,
 				proofHeight, consensusHeight,
 			)
@@ -333,27 +318,6 @@ func (suite *KeeperTestSuite) TestConnOpenAck() {
 			// retrieve client state of chainB to pass as counterpartyClient
 			counterpartyClient = suite.chainB.GetClientState(path.EndpointB.ClientID)
 		}, true},
-		{"success from tryopen", func() {
-			// chainA is in TRYOPEN, chainB is in TRYOPEN
-			err := path.EndpointB.ConnOpenInit()
-			suite.Require().NoError(err)
-
-			err = path.EndpointA.ConnOpenTry()
-			suite.Require().NoError(err)
-
-			// set chainB to TRYOPEN
-			connection := path.EndpointB.GetConnection()
-			connection.State = types.TRYOPEN
-			connection.Counterparty.ConnectionId = path.EndpointA.ConnectionID
-			suite.chainB.App.GetIBCKeeper().ConnectionKeeper.SetConnection(suite.chainB.GetContext(), path.EndpointB.ConnectionID, connection)
-			// update path.EndpointB.ClientID so state change is committed
-			path.EndpointB.UpdateClient()
-
-			path.EndpointA.UpdateClient()
-
-			// retrieve client state of chainB to pass as counterpartyClient
-			counterpartyClient = suite.chainB.GetClientState(path.EndpointB.ClientID)
-		}, true},
 		{"invalid counterparty client", func() {
 			err := path.EndpointA.ConnOpenInit()
 			suite.Require().NoError(err)
@@ -440,28 +404,6 @@ func (suite *KeeperTestSuite) TestConnOpenAck() {
 
 			version = types.NewVersion("2.0", nil)
 		}, false},
-		{"connection is in TRYOPEN but the set version in the connection is invalid", func() {
-			// chainA is in TRYOPEN, chainB is in TRYOPEN
-			err := path.EndpointB.ConnOpenInit()
-			suite.Require().NoError(err)
-
-			err = path.EndpointA.ConnOpenTry()
-			suite.Require().NoError(err)
-
-			// set chainB to TRYOPEN
-			connection := path.EndpointB.GetConnection()
-			connection.State = types.TRYOPEN
-			suite.chainB.App.GetIBCKeeper().ConnectionKeeper.SetConnection(suite.chainB.GetContext(), path.EndpointB.ConnectionID, connection)
-
-			// update path.EndpointB.ClientID so state change is committed
-			path.EndpointB.UpdateClient()
-			path.EndpointA.UpdateClient()
-
-			// retrieve client state of chainB to pass as counterpartyClient
-			counterpartyClient = suite.chainB.GetClientState(path.EndpointB.ClientID)
-
-			version = types.NewVersion("2.0", nil)
-		}, false},
 		{"incompatible IBC versions", func() {
 			err := path.EndpointA.ConnOpenInit()
 			suite.Require().NoError(err)
diff --git a/modules/core/03-connection/types/tx.pb.go b/modules/core/03-connection/types/tx.pb.go
index a37505743fb..4862d905716 100644
--- a/modules/core/03-connection/types/tx.pb.go
+++ b/modules/core/03-connection/types/tx.pb.go
@@ -115,9 +115,8 @@ var xxx_messageInfo_MsgConnectionOpenInitResponse proto.InternalMessageInfo
 // connection on Chain B.
 type MsgConnectionOpenTry struct {
 	ClientId string `protobuf:"bytes,1,opt,name=client_id,json=clientId,proto3" json:"client_id,omitempty" yaml:"client_id"`
-	// in the case of crossing hello's, when both chains call OpenInit, we need
-	// the connection identifier of the previous connection in state INIT
-	PreviousConnectionId string        `protobuf:"bytes,2,opt,name=previous_connection_id,json=previousConnectionId,proto3" json:"previous_connection_id,omitempty" yaml:"previous_connection_id"`
+	// Deprecated: this field is unused. Crossing hellos are no longer supported in core IBC.
+	PreviousConnectionId string        `protobuf:"bytes,2,opt,name=previous_connection_id,json=previousConnectionId,proto3" json:"previous_connection_id,omitempty" yaml:"previous_connection_id"` // Deprecated: Do not use.
 	ClientState          *types.Any    `protobuf:"bytes,3,opt,name=client_state,json=clientState,proto3" json:"client_state,omitempty" yaml:"client_state"`
 	Counterparty         Counterparty  `protobuf:"bytes,4,opt,name=counterparty,proto3" json:"counterparty"`
 	DelayPeriod          uint64        `protobuf:"varint,5,opt,name=delay_period,json=delayPeriod,proto3" json:"delay_period,omitempty" yaml:"delay_period"`
@@ -388,65 +387,66 @@ func init() {
 func init() { proto.RegisterFile("ibc/core/connection/v1/tx.proto", fileDescriptor_5d00fde5fc97399e) }
 
 var fileDescriptor_5d00fde5fc97399e = []byte{
-	// 927 bytes of a gzipped FileDescriptorProto
+	// 929 bytes of a gzipped FileDescriptorProto
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-	0xd0, 0x90, 0xca, 0x09, 0xa1, 0xce, 0xda, 0xc6, 0x57, 0x1c, 0xd1, 0xf9, 0x20, 0xbe, 0xf9, 0xfc,
-	0x4e, 0x72, 0xb4, 0x6e, 0x55, 0xb9, 0x29, 0x90, 0xf0, 0x18, 0x00, 0xe1, 0x25, 0x0e, 0xf1, 0xd5,
-	0x72, 0x4b, 0x39, 0xac, 0x75, 0xf6, 0xa2, 0x50, 0xbb, 0x27, 0x47, 0xc6, 0x3e, 0xdd, 0xaa, 0x70,
-	0x83, 0x2b, 0xf9, 0x24, 0x3d, 0x91, 0xa8, 0xac, 0x56, 0x78, 0xdc, 0xc1, 0x72, 0x45, 0xe1, 0x4d,
-	0x2b, 0x76, 0xb9, 0x05, 0xbb, 0xe0, 0x4e, 0xe2, 0x8d, 0x79, 0xed, 0xb0, 0x29, 0x53, 0x01, 0x0f,
-	0x6f, 0x44, 0xa1, 0xb6, 0xbf, 0x10, 0x9e, 0x02, 0x74, 0xeb, 0x5d, 0x91, 0x21, 0xdd, 0x80, 0xe7,
-	0xe0, 0x6e, 0xe6, 0x4d, 0xdb, 0x52, 0xfd, 0xcf, 0xb6, 0x68, 0x49, 0x5b, 0x0e, 0xd2, 0x21, 0x2c,
-	0x66, 0xd0, 0xad, 0x3b, 0xd9, 0x56, 0xd2, 0x9e, 0xb9, 0x70, 0x6b, 0x2b, 0x84, 0xdb, 0x04, 0xf7,
-	0xf3, 0x64, 0x99, 0xe9, 0xf6, 0xaf, 0xed, 0x1c, 0xdd, 0x9e, 0xa2, 0x11, 0xfc, 0x12, 0xbc, 0xb3,
-	0xa8, 0x3d, 0xa1, 0x5d, 0x35, 0x0a, 0xb5, 0x7a, 0x76, 0x3e, 0x59, 0x72, 0x35, 0x24, 0x4b, 0x0d,
-	0x81, 0xc6, 0x02, 0x89, 0xf2, 0x74, 0xfc, 0x51, 0x14, 0x6a, 0x0f, 0x73, 0x08, 0xb7, 0x94, 0x58,
-	0x95, 0x9d, 0x0b, 0x7a, 0xde, 0xe0, 0xb9, 0x5c, 0x7e, 0x0a, 0x4a, 0x1b, 0x3f, 0x05, 0xcb, 0x32,
-	0xd8, 0xbe, 0x45, 0x19, 0xb4, 0x81, 0x60, 0x77, 0xcf, 0xf7, 0x02, 0x75, 0x87, 0xd3, 0x51, 0x7a,
-	0x44, 0x33, 0x97, 0x6e, 0x95, 0xf9, 0x3a, 0x7e, 0x77, 0x97, 0x35, 0xb0, 0xbb, 0x99, 0x06, 0xca,
-	0xb7, 0xa2, 0x81, 0xca, 0x5b, 0xd5, 0x00, 0x58, 0x43, 0x03, 0xa7, 0x68, 0x94, 0x69, 0xe0, 0x97,
-	0x2d, 0xa0, 0x5e, 0x03, 0x74, 0xa9, 0x73, 0x4e, 0xbc, 0xc9, 0xa6, 0x3a, 0xc8, 0x26, 0xd7, 0x47,
-	0x23, 0x4e, 0xfb, 0x9c, 0xc9, 0xf5, 0xd1, 0x28, 0x9d, 0x5c, 0xac, 0xbc, 0x65, 0x22, 0x15, 0x6f,
-	0x91, 0x48, 0xf3, 0x66, 0x95, 0x56, 0x34, 0x4b, 0x07, 0xad, 0x55, 0xbd, 0x48, 0x1b, 0xf6, 0xf8,
-	0x9f, 0x22, 0x28, 0x3e, 0x65, 0x36, 0xfc, 0x11, 0xc0, 0x9c, 0x7f, 0xd4, 0xd1, 0x2a, 0x11, 0xe6,
-	0xfe, 0x20, 0x1a, 0x9f, 0xae, 0x05, 0x4f, 0xcf, 0x00, 0xbf, 0x07, 0xf7, 0xae, 0x7f, 0x36, 0x3e,
-	0xb9, 0x71, 0xae, 0xe7, 0x5e, 0xd0, 0x38, 0x5e, 0x07, 0xbd, 0xba, 0x70, 0x3c, 0xb3, 0x9b, 0x17,
-	0x3e, 0x45, 0xa3, 0x35, 0x0a, 0x4b, 0x34, 0x85, 0x3f, 0x29, 0x60, 0x2f, 0x9f, 0xa3, 0x8f, 0x6e,
-	0x9c, 0x2f, 0x89, 0x68, 0x7c, 0xb6, 0x6e, 0x44, 0x7a, 0x8a, 0xce, 0x8b, 0xd7, 0x97, 0x4d, 0xe5,
-	0xcd, 0x65, 0x53, 0xf9, 0xf3, 0xb2, 0xa9, 0xfc, 0x7a, 0xd5, 0x2c, 0xbc, 0xb9, 0x6a, 0x16, 0xfe,
-	0xb8, 0x6a, 0x16, 0x5e, 0x7e, 0x61, 0x13, 0xff, 0x62, 0x3a, 0x30, 0x10, 0x9d, 0x98, 0x88, 0xb2,
-	0x09, 0x65, 0x26, 0x19, 0xa0, 0x23, 0x9b, 0x9a, 0xb3, 0x63, 0x73, 0x42, 0x87, 0xd3, 0x31, 0x66,
-	0xe2, 0x8b, 0xfe, 0xe8, 0xc9, 0x91, 0xf4, 0x4b, 0xf7, 0x03, 0x17, 0xb3, 0xc1, 0x0e, 0x7f, 0x72,
-	0x9f, 0xfc, 0x1b, 0x00, 0x00, 0xff, 0xff, 0xe7, 0x63, 0x2e, 0xb2, 0x54, 0x0c, 0x00, 0x00,
+	0x14, 0xb6, 0x62, 0x27, 0xb1, 0xd7, 0x86, 0xbb, 0x5b, 0x9c, 0x44, 0x88, 0x3b, 0xcb, 0x08, 0x18,
+	0x52, 0x10, 0xe9, 0x7c, 0x17, 0x66, 0x20, 0x03, 0x45, 0xec, 0x86, 0x14, 0x07, 0x37, 0xe2, 0xe6,
+	0x66, 0xb8, 0xc6, 0x63, 0xcb, 0x1b, 0x65, 0xc7, 0xb6, 0x56, 0xa3, 0x95, 0x0d, 0xa2, 0xa5, 0x61,
+	0xa8, 0xe8, 0x68, 0xef, 0x3f, 0xf0, 0x27, 0xae, 0xbc, 0x92, 0x4a, 0x03, 0x49, 0x43, 0xad, 0x8e,
+	0x8e, 0xd1, 0xae, 0x24, 0xaf, 0x6d, 0x79, 0xb0, 0x71, 0xae, 0xdb, 0xb7, 0xef, 0x7b, 0xef, 0xed,
+	0xbe, 0xf7, 0x7d, 0x3b, 0x0b, 0x54, 0xdc, 0xb7, 0x0c, 0x8b, 0x78, 0xc8, 0xb0, 0x88, 0xe3, 0x20,
+	0xcb, 0xc7, 0xc4, 0x31, 0xa6, 0x2d, 0xc3, 0xff, 0x41, 0x77, 0x3d, 0xe2, 0x13, 0x78, 0x88, 0xfb,
+	0x96, 0x1e, 0x03, 0xf4, 0x19, 0x40, 0x9f, 0xb6, 0x94, 0xba, 0x4d, 0x6c, 0xc2, 0x20, 0x46, 0xbc,
+	0xe2, 0x68, 0xe5, 0x5d, 0x9b, 0x10, 0x7b, 0x84, 0x0c, 0x66, 0xf5, 0x27, 0x97, 0x46, 0xcf, 0x09,
+	0x12, 0x97, 0x50, 0x69, 0x84, 0x91, 0xe3, 0xc7, 0x55, 0xf8, 0x2a, 0x01, 0x7c, 0xbc, 0xe2, 0x28,
+	0x42, 0x5d, 0x06, 0xd4, 0x7e, 0xdf, 0x01, 0x07, 0x4f, 0xa8, 0xdd, 0xc9, 0xf6, 0xbf, 0x71, 0x91,
+	0x73, 0xe1, 0x60, 0x1f, 0xb6, 0x40, 0x85, 0xa7, 0xec, 0xe2, 0x81, 0x2c, 0x35, 0xa5, 0xe3, 0x4a,
+	0xbb, 0x1e, 0x85, 0xea, 0xdd, 0xa0, 0x37, 0x1e, 0x9d, 0x69, 0x99, 0x4b, 0x33, 0xcb, 0x7c, 0x7d,
+	0x31, 0x80, 0x5f, 0x83, 0x9a, 0x45, 0x26, 0x8e, 0x8f, 0x3c, 0xb7, 0xe7, 0xf9, 0x81, 0xbc, 0xd3,
+	0x94, 0x8e, 0xab, 0x8f, 0x3e, 0xd4, 0xf3, 0xaf, 0xad, 0x77, 0x04, 0x6c, 0xbb, 0xf4, 0x2a, 0x54,
+	0x0b, 0xe6, 0x5c, 0x3c, 0xfc, 0x1c, 0xec, 0x4f, 0x91, 0x47, 0x31, 0x71, 0xe4, 0x22, 0x4b, 0xa5,
+	0xae, 0x4a, 0xf5, 0x9c, 0xc3, 0xcc, 0x14, 0x0f, 0xcf, 0x40, 0x6d, 0x80, 0x46, 0xbd, 0xa0, 0xeb,
+	0x22, 0x0f, 0x93, 0x81, 0x5c, 0x6a, 0x4a, 0xc7, 0xa5, 0xf6, 0x51, 0x14, 0xaa, 0xef, 0xf0, 0x0b,
+	0x88, 0x5e, 0xcd, 0xac, 0x32, 0xf3, 0x29, 0xb3, 0xe0, 0x21, 0xd8, 0xa3, 0xd8, 0x76, 0x90, 0x27,
+	0xef, 0xc6, 0xd7, 0x36, 0x13, 0xeb, 0xac, 0xfc, 0xf3, 0x4b, 0xb5, 0xf0, 0xf7, 0x4b, 0xb5, 0xa0,
+	0xa9, 0xe0, 0x41, 0x6e, 0xd3, 0x4c, 0x44, 0x5d, 0xe2, 0x50, 0xa4, 0xfd, 0xb6, 0x0f, 0xea, 0x4b,
+	0x88, 0x67, 0x5e, 0xf0, 0x7f, 0xba, 0xfa, 0x1d, 0x38, 0x74, 0x3d, 0x34, 0xc5, 0x64, 0x42, 0xbb,
+	0xb3, 0x5b, 0xc7, 0xf1, 0x3b, 0x2c, 0xfe, 0x83, 0x28, 0x54, 0x1f, 0xf0, 0xf8, 0x7c, 0x9c, 0x26,
+	0x4b, 0x66, 0x3d, 0x75, 0xcd, 0x8e, 0x74, 0x31, 0x80, 0x4f, 0x41, 0x2d, 0x29, 0x49, 0xfd, 0x9e,
+	0x8f, 0x92, 0x2e, 0xd7, 0x75, 0xce, 0x3c, 0x3d, 0x65, 0x9e, 0x7e, 0xee, 0x04, 0x62, 0xef, 0xc4,
+	0x18, 0xcd, 0xac, 0x72, 0xf3, 0xdb, 0xd8, 0x5a, 0xa2, 0x40, 0x69, 0x4b, 0x0a, 0x2c, 0xce, 0x71,
+	0x77, 0x83, 0x39, 0x4e, 0xc1, 0x81, 0x98, 0xab, 0x9b, 0x70, 0x83, 0xca, 0x7b, 0xcd, 0xe2, 0x1a,
+	0x64, 0x6a, 0x37, 0xa3, 0x50, 0xbd, 0x9f, 0xdc, 0x38, 0x2f, 0x8f, 0x66, 0xd6, 0xc5, 0xfd, 0x24,
+	0x8c, 0xc2, 0x17, 0xa0, 0xe6, 0x7a, 0x84, 0x5c, 0x76, 0xaf, 0x10, 0xb6, 0xaf, 0x7c, 0x79, 0x9f,
+	0xf5, 0x40, 0x11, 0xca, 0x71, 0xa9, 0x4e, 0x5b, 0xfa, 0x57, 0x0c, 0xd1, 0x7e, 0x2f, 0xbe, 0xf9,
+	0xec, 0x4e, 0x62, 0xb4, 0x66, 0x56, 0x99, 0xc9, 0x91, 0xf0, 0x14, 0x00, 0xee, 0xc5, 0x0e, 0xf6,
+	0xe5, 0x72, 0x53, 0x3a, 0xae, 0xb5, 0x0f, 0xa2, 0x50, 0xbd, 0x27, 0x46, 0xc6, 0x3e, 0xcd, 0xac,
+	0x30, 0x83, 0x69, 0xf9, 0x2c, 0x3d, 0x11, 0xaf, 0x2c, 0x57, 0x58, 0xdc, 0xd1, 0x62, 0x45, 0xee,
+	0x4d, 0x2b, 0x76, 0x98, 0x05, 0x3b, 0xe0, 0x4e, 0xe2, 0x8d, 0x99, 0xed, 0xd0, 0x09, 0x95, 0x01,
+	0x0b, 0x57, 0xa2, 0x50, 0x3d, 0x9c, 0x0b, 0x4f, 0x01, 0x9a, 0xf9, 0x36, 0xcf, 0x90, 0x6e, 0xc0,
+	0x4b, 0x70, 0x37, 0xf3, 0xa6, 0x6d, 0xa9, 0xfe, 0x67, 0x5b, 0xd4, 0xa4, 0x2d, 0x47, 0xe9, 0x10,
+	0xe6, 0x33, 0x68, 0xe6, 0x9d, 0x6c, 0x2b, 0x69, 0xcf, 0x4c, 0xba, 0xb5, 0x15, 0xd2, 0x6d, 0x80,
+	0xfb, 0x79, 0xc2, 0xcc, 0x94, 0xfb, 0xd7, 0x6e, 0x8e, 0x72, 0xcf, 0xad, 0x21, 0xfc, 0x12, 0xbc,
+	0x35, 0xaf, 0x3e, 0xae, 0x5e, 0x39, 0x0a, 0xd5, 0x7a, 0x76, 0x3e, 0x41, 0x74, 0x31, 0x91, 0x05,
+	0xa9, 0x59, 0x40, 0x99, 0x23, 0x51, 0x9e, 0x92, 0x3f, 0x8a, 0x42, 0xf5, 0xfd, 0x1c, 0xc2, 0x2d,
+	0x24, 0x96, 0x45, 0xe7, 0x9c, 0x9e, 0xb7, 0x78, 0x30, 0x17, 0x9f, 0x82, 0xd2, 0xd6, 0x4f, 0xc1,
+	0xa2, 0x0c, 0x76, 0x6f, 0x51, 0x06, 0x2d, 0xc0, 0xd9, 0xdd, 0xf5, 0xbd, 0x40, 0xde, 0x63, 0x74,
+	0x14, 0x9e, 0xd1, 0xcc, 0xa5, 0x99, 0x65, 0xb6, 0x8e, 0x5f, 0xde, 0x45, 0x0d, 0xec, 0x6f, 0xa7,
+	0x81, 0xf2, 0xad, 0x68, 0xa0, 0xf2, 0x46, 0x35, 0x00, 0x36, 0xd0, 0xc0, 0xb9, 0x35, 0xcc, 0x34,
+	0xf0, 0xcb, 0x0e, 0x90, 0x97, 0x00, 0x1d, 0xe2, 0x5c, 0x62, 0x6f, 0xbc, 0xad, 0x0e, 0xb2, 0xc9,
+	0xf5, 0xac, 0x21, 0xa3, 0x7d, 0xce, 0xe4, 0x7a, 0xd6, 0x30, 0x9d, 0x5c, 0xac, 0xbc, 0x45, 0x22,
+	0x15, 0x6f, 0x91, 0x48, 0xb3, 0x66, 0x95, 0x56, 0x34, 0x4b, 0x03, 0xcd, 0x55, 0xbd, 0x48, 0x1b,
+	0xf6, 0xe8, 0x9f, 0x22, 0x28, 0x3e, 0xa1, 0x36, 0xfc, 0x11, 0xc0, 0x9c, 0x9f, 0xd4, 0xc9, 0x2a,
+	0x11, 0xe6, 0xfe, 0x21, 0x94, 0x4f, 0x37, 0x82, 0xa7, 0x67, 0x80, 0xdf, 0x83, 0x7b, 0xcb, 0xdf,
+	0x8d, 0x4f, 0xd6, 0xce, 0xf5, 0xcc, 0x0b, 0x94, 0xd3, 0x4d, 0xd0, 0xab, 0x0b, 0xc7, 0x33, 0x5b,
+	0xbf, 0xf0, 0xb9, 0x35, 0xdc, 0xa0, 0xb0, 0x40, 0x53, 0xf8, 0x93, 0x04, 0x0e, 0xf2, 0x39, 0xfa,
+	0x70, 0xed, 0x7c, 0x49, 0x84, 0xf2, 0xd9, 0xa6, 0x11, 0xe9, 0x29, 0xda, 0xcf, 0x5f, 0x5d, 0x37,
+	0xa4, 0xd7, 0xd7, 0x0d, 0xe9, 0xcf, 0xeb, 0x86, 0xf4, 0xeb, 0x4d, 0xa3, 0xf0, 0xfa, 0xa6, 0x51,
+	0xf8, 0xe3, 0xa6, 0x51, 0x78, 0xf1, 0x85, 0x8d, 0xfd, 0xab, 0x49, 0x5f, 0xb7, 0xc8, 0xd8, 0xb0,
+	0x08, 0x1d, 0x13, 0x6a, 0xe0, 0xbe, 0x75, 0x62, 0x13, 0x63, 0x7a, 0x6a, 0x8c, 0xc9, 0x60, 0x32,
+	0x42, 0x94, 0x7f, 0xd2, 0x1f, 0x3e, 0x3e, 0x11, 0xfe, 0xe9, 0x7e, 0xe0, 0x22, 0xda, 0xdf, 0x63,
+	0x4f, 0xee, 0xe3, 0x7f, 0x03, 0x00, 0x00, 0xff, 0xff, 0xdd, 0x12, 0x14, 0x2b, 0x56, 0x0c, 0x00,
+	0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/modules/core/03-connection/types/version.go b/modules/core/03-connection/types/version.go
index 7ae9e0b98b6..15ffc49d577 100644
--- a/modules/core/03-connection/types/version.go
+++ b/modules/core/03-connection/types/version.go
@@ -117,8 +117,8 @@ func GetCompatibleVersions() []exported.Version {
 // IsSupportedVersion returns true if the proposed version has a matching version
 // identifier and its entire feature set is supported or the version identifier
 // supports an empty feature set.
-func IsSupportedVersion(proposedVersion *Version) bool {
-	supportedVersion, found := FindSupportedVersion(proposedVersion, GetCompatibleVersions())
+func IsSupportedVersion(supportedVersions []exported.Version, proposedVersion *Version) bool {
+	supportedVersion, found := FindSupportedVersion(proposedVersion, supportedVersions)
 	if !found {
 		return false
 	}
diff --git a/modules/core/03-connection/types/version_test.go b/modules/core/03-connection/types/version_test.go
index 29838291dd8..2958c55fa38 100644
--- a/modules/core/03-connection/types/version_test.go
+++ b/modules/core/03-connection/types/version_test.go
@@ -57,7 +57,7 @@ func TestIsSupportedVersion(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		require.Equal(t, tc.expPass, types.IsSupportedVersion(tc.version))
+		require.Equal(t, tc.expPass, types.IsSupportedVersion(types.GetCompatibleVersions(), tc.version))
 	}
 }
 
diff --git a/modules/core/keeper/msg_server.go b/modules/core/keeper/msg_server.go
index 335998078b4..d00636bf8f1 100644
--- a/modules/core/keeper/msg_server.go
+++ b/modules/core/keeper/msg_server.go
@@ -117,7 +117,7 @@ func (k Keeper) ConnectionOpenTry(goCtx context.Context, msg *connectiontypes.Ms
 	}
 
 	if _, err := k.ConnectionKeeper.ConnOpenTry(
-		ctx, msg.PreviousConnectionId, msg.Counterparty, msg.DelayPeriod, msg.ClientId, targetClient,
+		ctx, msg.Counterparty, msg.DelayPeriod, msg.ClientId, targetClient,
 		connectiontypes.ProtoVersionsToExported(msg.CounterpartyVersions), msg.ProofInit, msg.ProofClient, msg.ProofConsensus,
 		msg.ProofHeight, msg.ConsensusHeight,
 	); err != nil {
diff --git a/proto/ibc/core/connection/v1/tx.proto b/proto/ibc/core/connection/v1/tx.proto
index 1ca0b404000..b2fea632c36 100644
--- a/proto/ibc/core/connection/v1/tx.proto
+++ b/proto/ibc/core/connection/v1/tx.proto
@@ -49,14 +49,13 @@ message MsgConnectionOpenTry {
   option (gogoproto.goproto_getters) = false;
 
   string client_id = 1 [(gogoproto.moretags) = "yaml:\"client_id\""];
-  // in the case of crossing hello's, when both chains call OpenInit, we need
-  // the connection identifier of the previous connection in state INIT
-  string                    previous_connection_id = 2 [(gogoproto.moretags) = "yaml:\"previous_connection_id\""];
-  google.protobuf.Any       client_state           = 3 [(gogoproto.moretags) = "yaml:\"client_state\""];
-  Counterparty              counterparty           = 4 [(gogoproto.nullable) = false];
-  uint64                    delay_period           = 5 [(gogoproto.moretags) = "yaml:\"delay_period\""];
-  repeated Version          counterparty_versions  = 6 [(gogoproto.moretags) = "yaml:\"counterparty_versions\""];
-  ibc.core.client.v1.Height proof_height           = 7
+  // Deprecated: this field is unused. Crossing hellos are no longer supported in core IBC.
+  string previous_connection_id = 2 [deprecated = true, (gogoproto.moretags) = "yaml:\"previous_connection_id\""];
+  google.protobuf.Any       client_state          = 3 [(gogoproto.moretags) = "yaml:\"client_state\""];
+  Counterparty              counterparty          = 4 [(gogoproto.nullable) = false];
+  uint64                    delay_period          = 5 [(gogoproto.moretags) = "yaml:\"delay_period\""];
+  repeated Version          counterparty_versions = 6 [(gogoproto.moretags) = "yaml:\"counterparty_versions\""];
+  ibc.core.client.v1.Height proof_height          = 7
       [(gogoproto.moretags) = "yaml:\"proof_height\"", (gogoproto.nullable) = false];
   // proof of the initialization the connection on Chain A: `UNITIALIZED ->
   // INIT`
diff --git a/testing/coordinator.go b/testing/coordinator.go
index dde3eb56b1a..a0550ed8589 100644
--- a/testing/coordinator.go
+++ b/testing/coordinator.go
@@ -194,6 +194,7 @@ func (coord *Coordinator) CommitNBlocks(chain *TestChain, n uint64) {
 		coord.IncrementTime()
 	}
 }
+<<<<<<< HEAD
 
 // ConnOpenInitOnBothChains initializes a connection on both endpoints with the state INIT
 // using the OpenInit handshake call.
@@ -233,3 +234,5 @@ func (coord *Coordinator) ChanOpenInitOnBothChains(path *Path) error {
 
 	return path.EndpointB.UpdateClient()
 }
+=======
+>>>>>>> 9aab42d (refactor: remove crossing hellos from 03-connection (#1672))