When dynamic send port is used with the MQSC BizTalk adapter, the adapter incorrectly converts cipherSpec, userid and password properties to lower case. This is not accepted by IBM MQ server.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This issue is fixed in the following cumulative update for Host Integration Server:
Learn about the terminology that Microsoft uses to describe software updates.
Third-party information disclaimer
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.