If the IP address that is displayed in this message is not correct, then issue the MODIFY DISPLAY,IPLIST command to determine whether the IP address was specified in the configuration file or was the result of a host name or MX name resolution. If you change the IP address, host name, or MX name in the configuration file, then issue a MODIFY REFRESH command to update the configuration settings. If the IP address is incorrect and is the result of a name resolution, then diagnose the resolver or Domain Name System (DNS) problems. If the IP address displayed in this message is correct, then check for network connectivity problems.

Examine the log file to determine the cause of the problem. Take the necessary corrective action. If you need more information to diagnose the error, issue MODIFY LOGLEVEL,LEVEL=47 to change log level value. Check the application trace log for failures. Try pinging the target server IP address from the system. If the ping works, check the configured port for this target server and ensure that the remote SMTP server is running and listening on that port. For example, if the server is running but does not send the protocol greeting after a successful connect() call, the server that is using the port might not be an SMTP server.

See the information about gathering diagnostic information about CSSMTP problems in z/OS Communications Server: IP Diagnosis Guide to determine what documentation you should obtain before contacting IBM® Service.