Applies to: BizTalk Server 2016 Enterprise with Feature Update, BizTalk Server 2016 Standard with Feature Update, BizTalk Server 2016 Developer with Feature Update
When a MessageBox is deleted, the "Login failed" error occurs from TDDS.
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 update for BizTalk Server:
Cumulative Update 8 for BizTalk Server 2016
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