This warning message accompanies message PWX-31061 and happens when an OpenSSL SSL_connect() function fails with error X'14094410', and the PowerExchange Listener cannot find an acceptable cipher in the client cipher list.
The task ends.
Either clear the SSL_CIPHER_LIST parameter or change it to a cipher that is available on the PowerExchange Listener machine. If the Listener is on z/OS, you can look at the AT_TLS rules for available ciphers.