Troubleshooting X.25 PAD
Symptom
Failed to log in to a remote device after placing an X.25 PAD call to the remote device. The system indicated the destination address was unreachable.
Solution
Check the following items:
The two ends of the X.25 PAD call are connected through an X.25 network and the physical connection is normal. The serial interfaces used for connection are enabled with X.25 encapsulation and both of them support X.25 PAD. One end is DCE, and the other is DTE, both using the same encapsulation type (IETF or nonstandard).
The destination X.121 address is correct. It must be the one assigned to the intended serial interface at the server end.
X.25 switching is disabled, or a route is available to the server end when X.25 switching is enabled. In the former case, the default route is used to route the call. In the second case, at least one route must be configured for routing the call.