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You notice that the proxy settings of Windows Communication Foundation (WCF) send ports are no longer taken into account at runtime. This affects WCF adapters that use HTTP or HTTPS transports (WCF-WebHttp, WCF-BasicHttp, WCF-WSHHttp, WCF-BasicHttpRelay) that have URL or Action mappings.

Note This problem was introduced in Cumulative Update 8 for BizTalk Server 2016 and Cumulative Update 1 for BizTalk Server 2020.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. 


This problem is fixed in the following cumulative updates for BizTalk Server:


For information about the service packs and cumulative update list for BizTalk Server, see the following article in the Microsoft Knowledge Base:

2555976 Service pack and cumulative update list for BizTalk Server

For more information about BizTalk Server hotfixes, see the following article in the Microsoft Knowledge Base:

2003907 Information about BizTalk hotfixes and Cumulative Update support

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