While troubleshooting a connectivity issue between Cisco Unified Communications Manager, Expressway-C, and Expressway-E, an engineer sees this output in the Expressway-E logs. Event="Authentication…

Question

Options

• AThe Expressway-C Traversal Server username/password do not match the Expressway-E
• BThe Expressway-C Traversal Client username/password do not match the Expressway-E
• CThe Expressway-C Traversal Zone username/password do not match the Expressway-E
• DThe Expressway-C Traversal Zone username/password do not match the Expressway-E
• EThe Expressway-C Traversal Server username/password do not match the Expressway-E

• A
  6% (1)
• B
  81% (13)
• D
  13% (2)

Explanation

The log entry shows an authentication failure originating from IP 10.50.2.1, which is a private/internal IP address - this is the Expressway-C initiating a connection toward Expressway-E. In the traversal zone model, Expressway-C acts as the traversal client and Expressway-E acts as the traversal server. The traversal client (Expressway-C) must authenticate to the traversal server (Expressway-E) using a username and password configured on both sides. When the log shows 'Incorrect authentication credential,' it means the username/password configured on the Expressway-C traversal client zone does not match the credential set defined on the Expressway-E traversal server zone. The fix is to ensure the credentials match on both ends. Choices A, C, D, and E use incorrect terminology (e.g., 'Traversal Server' on the C side) which does not reflect the correct role assignments.

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