Hi Partha,
From what i gather, the messages that are stuck are request messages from a 3rd party web service client. Is that correct?
In that case, the most likely scenario is that the client would have discarded these requests by now. So resending these messages would serve no purpose.
Having said that, for this specific issue, the <CONNECTION> is AFW and <PROTOCOL> is the adapter type you are using to connect to CRM. For example, if it is XI, use XI. If it is HTTP, use HTTP.
Hope this helps to resolve your issue.
Thanks.
Kind regards,
Kapila