Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 5406)
+++ /CKEditor/trunk/CHANGES.html	(revision 5407)
@@ -46,4 +46,5 @@
 	<ul>
 		<li><a href="http://dev.fckeditor.net/ticket/5330">#5330</a> : Corrected detection of Ctrl and Meta keys in Macs for the context menu.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/5434">#5434</a> : Fixed access denied issues with IE when accessing web sites through IPv6 IP addresses.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/core/env.js
===================================================================
--- /CKEditor/trunk/_source/core/env.js	(revision 5406)
+++ /CKEditor/trunk/_source/core/env.js	(revision 5407)
@@ -76,5 +76,10 @@
 			isCustomDomain : function()
 			{
-				return this.ie && document.domain != window.location.hostname;
+				var domain = document.domain,
+					hostname = window.location.hostname;
+
+				return this.ie &&
+					domain != hostname &&
+					domain != ( '[' + hostname + ']' );	// IPv6 IP support (#5434)
 			}
 		};