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We are setting up a SSL socket for certain transactions. The socket APIs have been unchanged since V4R3. If we run the code on V5R2 it works fine. If we run on V4R4 it fails during the Handshake with an Invalid argument, even though both releases use the exact same APIs. The failing errno=3021. We know the socket opens and passes data initially and the remote server passes back certificate info and tells the 400 its cipherkind is ok. At this point the AS/400 simply closes the connection. If anyone else has had a similar experience we would appreciate your input.