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chore: update port-forwarding documentation #10916

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Nov 28, 2023
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chore: update port-forwarding documentation #10916

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16 changes: 10 additions & 6 deletions docs/networking/port-forwarding.md
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Expand Up @@ -52,16 +52,20 @@ For more examples, see `coder port-forward --help`.
> [wildcard access URL](../admin/configure.md#wildcard-access-url). If an access
> URL is not specified, Coder will create
> [a publicly accessible URL](../admin/configure.md#tunnel) to reverse proxy the
> deployment, and port forwarding will work. There is a known limitation where
> if the port forwarding URL length is greater than 63 characters, port
> forwarding will not work.
> deployment, and port forwarding will work.
>
> There is a
> [DNS limitation](https://datatracker.ietf.org/doc/html/rfc1035#section-2.3.1)
> where each segment of hostnames must not exceed 63 characters. If your app
> name, agent name, workspace name and username exceed 63 characters in the
> hostname, port forwarding via the dashboard will not work.

### From an arbitrary port

One way to port forward in the dashboard is to use the "Port forward" button to
specify an arbitrary port. Coder will also detect if processes are running, and
will list them below the port picklist to click an open the running processes in
the browser.
specify an arbitrary port. Coder will also detect if apps inside the workspace
are listening on ports, and list them below the port input (this is only
supported on Windows and Linux workspace agents).

![Port forwarding in the UI](../images/port-forward-dashboard.png)

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