System information

Troubleshooting XNS 14-309

XNS: Clients Cannot Connect to Server over PSN

Symptom: Clients cannot connect to servers across a PSN. Clients can communicate with servers

located on the local network.

Table 14-3 outlines the problems that might cause this symptom and describes solutions to those

problems.

Table 14-3 XNS: Clients Cannot Connect to Server over PSN (continued)

Possible Problem Solution

Address mapping error

Step 1 Use the show running-conﬁg privileged exec command to view the

conﬁguration of the router.

Step 2 If you are running X.25, make sure x25 map xns interface

conﬁguration commands are properly conﬁgured. Make sure MAC

addresses and X.121 addresses are correctly speciﬁed.

Step 3 If you are running Frame Relay, make sure frame-relay map xns

interface conﬁguration commands are properly conﬁgured. Make

sure MAC addresses and DLCIs

are correctly speciﬁed.

Mismatched router network number

Step 1 Check the network numbers of network servers. This information

will be provided by the local XNS server administration staff.

Step 2 Check the network number speciﬁed on the server side of the router.

Step 3 Compare the network numbers. If they do not match, reconﬁgure the

router or servers as appropriate, with the correct network number.

Step 4 If the network numbers match, check the router interface on the

client side and make sure the assigned network number is unique

with respect to all network numbers in the XNS internetwork.

Encapsulation mismatch

Step 1 Use the show interfaces exec command to determine the

encapsulation type being used (such as encapsulation x25).

Step 2 If an encapsulation command is not present, the default is HDLC

encapsulation. For PSN interconnection, you must explicitly specify

an encapsulation type. To set the encapsulation method used by the

interface, use the encapsulation interface conﬁguration command.