Problem

How to explain message "CFTN05E accept failed The operation would have caused that the process would have been suspended..."

Resolution

The CFTN05E relates to an error during a TCP/IP socket operation.

It can be without incidence on transfers (incoming call not related to a PeSIT transfer, port health-check, operation on port used by CFT, port scanning).

The connect fails to be accepted, it looks like a sort of health-check that close the socket before CFT has been able to accept it?

Tracing connections to the CFT ports and then identify unattended sources IP can help in finding the root cause.

Another way to ensure only authorized connections are passed to CFT is to filter through a firewall.