If a remote system cannot connect to your iSeries™, there are several areas you need to check. If the remote device is polling your server, but the system operator message queue does not contain a message regarding your system being polled, check the Product Activity Log for messages regarding line descriptions and system reference code AF06.
See Display the Product Activity Log in the Get started with communications topic collection for complete instructions and links to more information.
A connection failure can occur if the remote system uses a destination service access point (DSAP) that your line description does not refer to. Another possible cause might be that the line description that contains the correct DSAP is not in the Switched line list field of the correct controller description. If the AF06 system reference code is absent, the error might still have occurred. Verify that the adapter address, SSAP, and DSAP values for both your server and the remote system are correct.