> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/cortex-xsoar-6-multi-tenant-guides/6.12/onboard-multi-tenant/plan-your-multi-tenant-deployment/change-the-port-for-host-to-main-communication.md).

# Change the Port for Host to Main Communication

In some cases, a host in an external network might not be able to connect to the main account via the default port, due to security restrictions. You can add a server configuration to open a custom port. The server configuration must be added on the main account.

1. In the main account, go to Settings → ABOUT → **Troubleshooting**.
2. In the **Server Configuration** section click **Add Server Configuration**.

   | Key                     | Value         |
   | ----------------------- | ------------- |
   | host.communication.port | `port number` |
3. Restart the server.

   For a high availability deployment, restart all main servers.


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