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WebUI Not Reachable Using Computer Name

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To avoid confusion this issue is related to accessing the Web UI over a local LAN. When I posted this in troubleshooting there was confusion with people thinking I was talking about accessing it over the internet.

Devices on a local LAN have a device name/computer name. These names can be used to access services on the device. Examples might be file browsing, or a web server (e.g. http://TheServer), or a subsonic music server (e.g. http://TheServer:4040/index.view), or an Emby media server (http://TheServer:8096/web/dashboard.html), and until a recent update , uTorrent (e.g. http://TheServer:9091/gui/).

Now uTorrent no longer responds when using the computer name, giving a 400 error. Using the IP address works fine as before (e.g. If I'm actually on the server localhost works and so does the loopback address, but not the device name, locally or over the LAN. 

This has previously been working for a few years. All other services (as listed above) continue to work with the device name just fine. 

This isn't a huge deal but I would prefer to be able to use the device name rather than IP address if possible.

Edited to add: I noticed in the change log for the last release "– Sanity check Host header on HTTP requests" among other changes to the Web UI . Wondering if it is related to this.

Edited by einniv

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