The server "X" does not have a valid connection for casting. Check that the server is claimed

Plex Media Server Desktops & Laptops
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Today I started getting an error when I try to cast Plex to my Chromecast. It says “The server “Jeff-PC” does not have a valid connection for casting. Check that the server is claimed in server settings.” I am running a Windows 10 machine and accessing Plex with Chrome 65.0.3325.181. I have already looked through the forums and I see other people have had this issue, but I have tried all the things other people have suggested and it still doesn’t work for me. I have tried restarted Plex server times. I can play content on the web portal and through the Plex Home Theater app. Interestingly for some reason, I cannot access my server at all on the Android app anymore, but I’m less worried about that as I rarely use the Plex android app. I opened the console in Chrome and I see this error “GET http://127.0.0.1:32400/video/:/transcode/universal/dash/rz7b8wlpsiac436juufabu9u/1/6.m4s 404 (Not Found)” but I don’t know if that is related at all since I think that error showed up before I tried to cast. I’ve found I am still able to cast if I don’t cast the Plex app in Chrome and instead cast the tab that has Plex in it. That is not a long term solution though since the resolution doesn’t seem to be as good casting it this way.

Any help would be greatly appreciated.

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I figured it out. For some reason, it was a conflict with my anti-virus (Avast). I just toggeled the anti-virus firewall and it works now. I don’t know why simply turning the firewall off and back on would fix it but it seemed to have done the trick.

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There are a couple of problems here:
The error message tells you to claim the Server in settings and yet there is nothing in settings that suggests “claim”, so we’re at a loss.
What’s happening is that there is an issue in security; it’s likely there have been an update or maybe you’ve setup a new Server during you being signed in?
To “claim” the Server, sign out and sign back in.
Reboot Chromecast if you want to.
Normal service will be restored.

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The avast fix worked. Had to change settings from public to private network, restart plex, and it started working!

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