diff --git a/Package.swift b/Package.swift
index ae9f039..07f042d 100644
--- a/Package.swift
+++ b/Package.swift
@@ -3,7 +3,7 @@ import PackageDescription
 let package = Package(
     name: "PerfectLDAP",
     dependencies:[
-      .Package(url: "https://github.com/RockfordWei/Perfect-ICONV.git", majorVersion: 1),
+      .Package(url: "https://github.com/PerfectSideRepos/Perfect-ICONV.git", majorVersion: 1),
       .Package(url:"https://github.com/PerfectlySoft/Perfect-Thread.git", majorVersion: 2),
       .Package(url:"https://github.com/PerfectlySoft/Perfect-OpenLDAP.git", majorVersion: 1)
     ]
diff --git a/Sources/PerfectLDAP.swift b/Sources/PerfectLDAP.swift
index 8c05e8a..1f3fb39 100644
--- a/Sources/PerfectLDAP.swift
+++ b/Sources/PerfectLDAP.swift
@@ -158,6 +158,22 @@ public class LDAP {
     }//end str
   }//end string
 
+  public var _supportedControls = [String]()
+
+  /// load session control OIDs from server
+  /// - throws:
+  ///   Exception with messages.
+  public func checkServerSideControls() throws {
+    guard let r = try self.search() else {
+      throw Exception.message("load controls failed")
+    }//end guard
+    guard let root = r.dictionary[""] else {
+      throw Exception.message("control has no expected key")
+    }//end guard
+    _supportedControls = root["supportedControl"] as? [String] ?? []
+    
+  }//end func
+
   /// constructor of LDAP. could be a simple LDAP() to local server or LDAP(url) with / without logon options.
   /// if login parameters were input, the process would block until finished.
   /// so it is strongly recommanded that call LDAP() without login option and call ldap.login() {} in async mode
diff --git a/Tests/PerfectLDAPTests/PerfectLDAPTests.swift b/Tests/PerfectLDAPTests/PerfectLDAPTests.swift
index 0fd171c..d94177e 100644
--- a/Tests/PerfectLDAPTests/PerfectLDAPTests.swift
+++ b/Tests/PerfectLDAPTests/PerfectLDAPTests.swift
@@ -46,6 +46,9 @@ class PerfectLDAPTests: XCTestCase {
 
       let succ = ldap.login(username: testUSR, password: testPWD)
       XCTAssertTrue(succ)
+
+      try ldap.checkServerSideControls()
+      print(ldap._supportedControls)
     }catch(let err) {
       XCTFail("testLoginSync error: \(err)")
     }