When you're using an HTTP send port to communicate with a web server, you may find that the HTTP send port instance always stays in active status when there's some intermittent network failure between BizTalk Server and the web server.
If you capture the network trace for this scenario, you may notice that the network connection is actually not fully established.
The issue occurs because the requesttimeout setting on this HTTP send port doesn’t take effect when the connection is not fully established. Therefore, the send port instance stays in active status instead of timing out.
Cumulative update information
This issue was first fixed in the following cumulative update of BizTalk Server:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For information about the service packs and cumulative update list for BizTalk Server, see KB 2555976: Service pack and cumulative update list for BizTalk Server.
For more information about BizTalk Server hotfixes, see KB 2003907: Information about BizTalk hotfixes and cumulative update support.