Error: "Unable to join player connection multicast group."

When i open unity i get this error

Unable to join player connection multicast group.

What that is and how i can fix it?

hey same error here 2…jst installed unity3d and its extension today but cant resolve this problem…if u can help me out with this …i would be grateful

I had the same problem, same message on Console. Couldnt locate the cause.
Actions:
So I made a backup and start stripping the copy project.
I end with AN EMPTY PROJECT and still getting those messages, one more about “sockets:”.
Noticed I got the same error when I opened other projects!.

It seams it has something to do with RAM MEMORY AVAILABLE, I read somewhere.
SOLUTION: Quit Unity, restart the pc. On restart, try freeing Ram memory. then open Unity.
It solve my problem.
Hope it helps…,

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I have 128GB of ram on my development machine (Quad Xeons) and I get this as well. my research comes down to a firewall issue from hat I can tell. seems to happen on machines with non standard networking setup (vpn, bridge, etc) Unity starts some kind of local server (you can see the node.js process in task manager) and some security/firewall setting or odd networking setup is causing it to fail to start that server. I believe its some sort of cache server that unity uses

I just noticed this today, and haven’t a clue what might’ve changed since the last time I used Unity Editor, which was many months ago. I’m not even sure if it’s something I should worry about since it sounds like something relevant only for multiplayer, but I’d still like to know what it is, and if it’s not important, I’d like to suppress the error. Incidentally, wasn’t there a multiplayer API (I think for matchmaking?) that was being phased out?

me too…