PAP and CHAP Authentication Failure

PAP and CHAP Authentication Failure

If PAP or CHAP authentication fails, it usually means that the authentication credentials provided by the remote peer do not match the ones configured on the local device.

To troubleshoot PAP or CHAP authentication failure, you can follow these steps:

Verify the authentication credentials on both sides: Check if the username and password configured on the local device match the ones configured on the remote device. You can also check if the password is stored in clear text or encrypted.

Check the PPP authentication configuration: Ensure that the correct authentication method (PAP or CHAP) is configured on both sides. You can also check if the authentication timeout is configured correctly.

Verify connectivity: Verify if there is connectivity between the two devices by checking the physical layer (cables, interfaces, etc.) and the data link layer (encapsulation, framing, etc.).

Check for errors and logs: Check the logs on both sides to see if there are any error messages related to PPP authentication. You can also check the debug output to see if there are any issues with the authentication process.

Verify the PPP session status: Verify the PPP session status on both sides to ensure that the link is established and the PPP session is active. You can also check the PPP negotiation process to see if there are any issues with the negotiation parameters.

Try alternative authentication methods: If the authentication failure persists, try using alternative authentication methods such as MS-CHAP or EAP. By following these steps, you can troubleshoot PAP and CHAP authentication failure and resolve the issue.

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