diff --git a/jetty-client/src/test/java/org/eclipse/jetty/client/ConnectionPoolTest.java b/jetty-client/src/test/java/org/eclipse/jetty/client/ConnectionPoolTest.java
index dd8479061a6e..c296014e0060 100644
--- a/jetty-client/src/test/java/org/eclipse/jetty/client/ConnectionPoolTest.java
+++ b/jetty-client/src/test/java/org/eclipse/jetty/client/ConnectionPoolTest.java
@@ -379,7 +379,7 @@ public void resolve(String host, int port, Promise<List<InetSocketAddress>> prom
     @MethodSource("pools")
     public void testConcurrentRequestsAllBlockedOnServerWithLargeConnectionPool(ConnectionPoolFactory factory) throws Exception
     {
-        int count = 50;
+        int count = 10;
         testConcurrentRequestsAllBlockedOnServer(factory, count, 2 * count);
     }
 
@@ -387,7 +387,7 @@ public void testConcurrentRequestsAllBlockedOnServerWithLargeConnectionPool(Conn
     @MethodSource("pools")
     public void testConcurrentRequestsAllBlockedOnServerWithExactConnectionPool(ConnectionPoolFactory factory) throws Exception
     {
-        int count = 50;
+        int count = 10;
         testConcurrentRequestsAllBlockedOnServer(factory, count, count);
     }
 
@@ -441,10 +441,12 @@ protected void service(String target, org.eclipse.jetty.server.Request jettyRequ
                 {
                     if (result.isSucceeded())
                         latch.countDown();
+                    else
+                        result.getFailure().printStackTrace();
                 }));
         }
 
-        assertTrue(latch.await(5, TimeUnit.SECONDS), "server requests " + barrier.getNumberWaiting() + "<" + count + " - client: " + client.dump());
+        assertTrue(latch.await(15, TimeUnit.SECONDS), "server requests " + barrier.getNumberWaiting() + "<" + count + " - client: " + client.dump());
         List<Destination> destinations = client.getDestinations();
         assertEquals(1, destinations.size());
         // The max duration connection pool aggressively closes expired connections upon release, which interferes with this assertion.
diff --git a/jetty-http2/http2-client/src/test/java/org/eclipse/jetty/http2/client/StreamCloseTest.java b/jetty-http2/http2-client/src/test/java/org/eclipse/jetty/http2/client/StreamCloseTest.java
index 5dc0beb00c91..1cd02492f09b 100644
--- a/jetty-http2/http2-client/src/test/java/org/eclipse/jetty/http2/client/StreamCloseTest.java
+++ b/jetty-http2/http2-client/src/test/java/org/eclipse/jetty/http2/client/StreamCloseTest.java
@@ -14,6 +14,7 @@
 package org.eclipse.jetty.http2.client;
 
 import java.nio.ByteBuffer;
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.CountDownLatch;
@@ -38,6 +39,8 @@
 import org.eclipse.jetty.util.Promise;
 import org.junit.jupiter.api.Test;
 
+import static org.awaitility.Awaitility.await;
+import static org.hamcrest.Matchers.equalTo;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
@@ -179,7 +182,7 @@ public void succeeded()
         assertTrue(serverDataLatch.await(5, TimeUnit.SECONDS));
         assertTrue(completeLatch.await(5, TimeUnit.SECONDS));
         assertTrue(stream.isClosed());
-        assertEquals(0, stream.getSession().getStreams().size());
+        await().atMost(Duration.ofSeconds(5)).until(() -> stream.getSession().getStreams().size(), equalTo(0));
     }
 
     @Test
diff --git a/jetty-server/src/main/java/org/eclipse/jetty/server/MultiPartInputStreamParser.java b/jetty-server/src/main/java/org/eclipse/jetty/server/MultiPartInputStreamParser.java
index a66df1cef9b3..c070f2cf479d 100644
--- a/jetty-server/src/main/java/org/eclipse/jetty/server/MultiPartInputStreamParser.java
+++ b/jetty-server/src/main/java/org/eclipse/jetty/server/MultiPartInputStreamParser.java
@@ -941,7 +941,7 @@ else if (_line.length() == 0)
                 _pos = 0;
             }
 
-            return _buffer[_pos++];
+            return _buffer[_pos++] & 0xFF;
         }
     }
 }
diff --git a/jetty-websocket/websocket-core-common/src/main/java/org/eclipse/jetty/websocket/core/internal/messages/MessageInputStream.java b/jetty-websocket/websocket-core-common/src/main/java/org/eclipse/jetty/websocket/core/internal/messages/MessageInputStream.java
index 12b20ce350f0..d670440c87fd 100644
--- a/jetty-websocket/websocket-core-common/src/main/java/org/eclipse/jetty/websocket/core/internal/messages/MessageInputStream.java
+++ b/jetty-websocket/websocket-core-common/src/main/java/org/eclipse/jetty/websocket/core/internal/messages/MessageInputStream.java
@@ -87,7 +87,7 @@ public int read() throws IOException
             if (len < 0) // EOF
                 return -1;
             if (len > 0) // did read something
-                return buf[0];
+                return buf[0] & 0xFF;
             // reading nothing (len == 0) tries again
         }
     }
diff --git a/jetty-websocket/websocket-jetty-common/src/test/java/org/eclipse/jetty/websocket/common/MessageInputStreamTest.java b/jetty-websocket/websocket-jetty-common/src/test/java/org/eclipse/jetty/websocket/common/MessageInputStreamTest.java
index 74929abe8b5a..e22965db5edc 100644
--- a/jetty-websocket/websocket-jetty-common/src/test/java/org/eclipse/jetty/websocket/common/MessageInputStreamTest.java
+++ b/jetty-websocket/websocket-jetty-common/src/test/java/org/eclipse/jetty/websocket/common/MessageInputStreamTest.java
@@ -33,6 +33,7 @@
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTimeout;
 
@@ -279,4 +280,23 @@ public void testAppendNullPayloadRead() throws IOException
             }
         });
     }
+
+    @Test
+    public void testReadSingleByteIsNotSigned() throws Exception
+    {
+        try (MessageInputStream stream = new MessageInputStream())
+        {
+            // Byte must be greater than 127.
+            int theByte = 200;
+            // Append a single message (simple, short)
+            Frame frame = new Frame(OpCode.BINARY);
+            frame.setPayload(new byte[]{(byte)theByte});
+            frame.setFin(true);
+            stream.accept(frame, Callback.NOOP);
+
+            // Single byte read must not return a signed byte.
+            int read = stream.read();
+            assertEquals(theByte, read);
+        }
+    }
 }