Outage in Fat Zebra
91 - Host or Switch Unavailable errors affecting CBA merchants
Resolved MajorIncident Report
We are currently investigating a problem with CBA merchants receiving '91 - Host or Switch Unavailable' responses for all transactions.
Components affected
Fat Zebra Gateway: Commonwealth BankTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
RESOLVED
16 days ago - at 09/01/2026 10:52AM
This incident has been resolved.
MONITORING
16 days ago - at 09/01/2026 10:32AM
Transactions for CBA merchants are now processing successfully. We will continue to monitor during the evening for any further problems.
INVESTIGATING
16 days ago - at 09/01/2026 10:18AM
We are currently investigating a problem with CBA merchants receiving '91 - Host or Switch Unavailable' responses for all transactions.
Latest Fat Zebra outages
Payment failures with Mastercard cards - about 1 month ago
Gateway transactions timing out - about 2 months ago
Downstream issues with EFTPOS - 3 months ago
Transaction time outs - 4 months ago
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