Fat Zebra incident

91 - Host or Switch Unavailable errors affecting Westpac merchants

Critical Resolved View vendor source →

Fat Zebra experienced a critical incident on December 10, 2025 affecting Gateway: Westpac & Bank of Melbourne, lasting 2h 32m. The incident has been resolved; the full update timeline is below.

Started
Dec 10, 2025, 02:37 AM UTC
Resolved
Dec 10, 2025, 05:10 AM UTC
Duration
2h 32m
Detected by Pingoru
Dec 10, 2025, 02:37 AM UTC

Affected components

Gateway: Westpac & Bank of Melbourne

Update timeline

  1. investigating Dec 10, 2025, 02:37 AM UTC

    We are currently investigating a problem with Westpac merchants receiving '91 - Host or Switch Unavailable' responses for all transactions.

  2. monitoring Dec 10, 2025, 02:59 AM UTC

    Transactions for Westpac merchants are now processing successfully. We will continue to monitor during the afternoon for any further problems.

  3. resolved Dec 10, 2025, 05:10 AM UTC

    This incident has been resolved.