During our BizTalk migration, we have encountered below error in the BizTalk administration console

Reason: Unable to cast object of type ‘Microsoft.BizTalk.Streaming.VirtualStream’ to type ‘System.IO.MemoryStream’.

We thought it would be certificate error and we are checking partner certificate and our certificate.

But when we checked the event viewer, we are seeing the below error and interestingly we are not seeing this Error in our old server when the partner is sending the same file again and again

So we compared the EDI settings of same party in Old server with new server and we identified the issue

Duplicate check functionality is enabled in new server and it was disabled in old server for interchange settings

New Server Interchange Settings

Old Server Interchange Settings

So disabled the settings and issue got fixed.

Regards,

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