POS Terminals Error Code
Systems & Devices
POS Terminals
NO CONNECTION | Host connection unavailable
Industry
Systems & Devices
Canonical
/systems/pos-terminals/error-codes/no-connection/
Last Updated
Feb 27, 2026
Summary
The terminal cannot reach the payment host/gateway to authorize the transaction.
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What This Code Means
No-connection messages indicate the terminal cannot reach the processor/host. This can be caused by internet issues, misconfigured network settings, DNS problems, or an upstream outage.
Where Users Usually See This Code
- At sale time when authorizing a card
- During batch close/settlement attempts
Why This Code Appears
- Internet outage or unstable Wi-Fi/Ethernet
- Firewall blocks outbound host connections
- Processor outage
What Typically Happens Next
- Transactions cannot be authorized until connectivity is restored
What This Code Is Not
- It is not a card decline by the issuer
- It is not a terminal tamper event
Troubleshooting Checklist
- □ Verify the terminal has network access
- □ Reboot the router or switch and retry
- □ Test with a different network (e.g., backup connection) if available
Notes And Edge Cases
Some terminals support offline modes; use them only if your processor/acquirer allows it.
Related Codes
8 links
- DUPLICATE CodeDuplicate transaction
- COMMUNICATION ERROR CodeHost communication failed
- DECLINED CodeIssuer declined
- HOST UNAVAILABLE CodeHost unreachable
- MAC ERROR CodeMessage authentication error
- PAPER OUT CodeReceipt paper empty
- REVERSAL CodeReversal required
- INVALID TID CodeTerminal ID invalid
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