> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/knowledge-hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/knowledge-hub/products/cc-software/troubleshoot/command-centre-errors/command-centre-errors-network-failure.md).

# Network Failure - Arming and alarm terminals

[Command Centre - Errors](/knowledge-hub/products/cc-software/troubleshoot/command-centre-errors.md) › Network Failure - Arming and alarm terminals

When arming an Alarm Zone from an Alarm Terminal, this error appears on the Alarm Terminal:

```
Network failure in [Alarm Zone name]
```

![Alarm terminal showing network failure in the alarm zone](https://328339335-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6bM8WhlBE9BYizPWJaPN%2Fuploads%2Fgit-blob-8e789c34dbce1d8e6e12c603dfe11e5dc8ac9025%2FSECHUB-CCS-ERR-NETWORK-ARMING-01.jpg?alt=media)

The Alarm Zone resides on one controller (Controller 2), and the Alarm Terminal is connected to another controller (Controller 1). For the Terminal to control the Alarm Zone on Controller 2, Controller 1 must be able to communicate with Controller 2 across the network. If that connection is denied, this alarm is displayed.

![Diagram: two controllers, terminal on Controller 1 arming a zone on Controller 2](https://328339335-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6bM8WhlBE9BYizPWJaPN%2Fuploads%2Fgit-blob-08902adb8585dfa9ae2b568153121c6686eba5ba%2FSECHUB-CCS-ERR-NETWORK-ARMING-02.png?alt=media)

## Resolution

Ensure the network configuration allows communication between controllers on **port 1072**. This is not restricted by Gallagher; it is restricted by the network infrastructure.


---

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