> For the complete documentation index, see [llms.txt](https://docs.pritunl.com/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pritunl.com/kb/zero/general/debugging-zero.md).

# Debugging

### Internal Service Domain

Some services will expect a specific domain when internal web requests are received. In the example below the Pritunl Zero server is running on `service.pritunl.com` and is routing requests to the internal service on `software.pritunl.com`. Web requests sent to this internal service will have the host header set to `service.pritunl.com`. If the internal service expects the `software.pritunl.com` domain these requests will fail.

![](https://github.com/pritunl/pritunl-docs/blob/master/pritunl-zero/.gitbook/assets/zero_debug0.png)

This can be fixed by setting the *Host* field in the *External Domains*. This will overwrite the host sent to the internal service to match the expected domain.

![](https://github.com/pritunl/pritunl-docs/blob/master/pritunl-zero/.gitbook/assets/zero_debug1.png)

### Debugging Errors

More error information from web requests can be found by by clicking *Developer tools* under the *More tools* menu in Chrome. The *Network* and *Console* tab can provide additional information about errors.


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