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Hello @johnnyoldson Thanks for your detailed answer. I followed your instructions and successfully sent the message to SAP ICH. Thanks again for your help.

Hello all, I have the same issue, and the SAP ICH guys said I need to use mTLS. I understand that, it is not related with AS2 certificates. When I said that we are using OpenAS2, their response was, mTLS is not supported by OpenAS2. We have another tools to connect via SAP ICH via SOAP, for authentication we sent both SAP ICH and our certificate with our request message. Is this something like that to do development on OpenAS2 or I missed some configuration. @johnnyoldson Did you solve the issue...