Assume that you use Microsoft BizTalk Server 2013 R2 or BizTalk Server 2013 and that you use a WCF-BasicHttp send port to communicate with an external web service. In this scenario, if the web service returns an incorrect response (for example, an incorrect ContentType element), the WCF-BasicHttp send port instance remains in an "Active" state instead of being suspended as expected.
Note This is likely to cause a build-up in the MsgBox container. This in turn causes throttling and performance issues.
Cumulative update information
BizTalk Server 2013 R2
This issue was first fixed in the following cumulative update for BizTalk Server 2013 R2: