I'm getting the exact same error poping up, been happening for about 24 or so hours at least.
edit-1:
I signed out and unregistered my instance just to see what would happen if i tried reconnecting it again and it's showing similar error still:
edit-2: Error is gone now, i reset my router 2 days ago some settings may of been causing the error they were firewall/ddos (general security) that i altered and now the error is gone. I'll try to verify if this is what was causing it on my end and which setting and update soon.
Edit-3: Error still gone, i'm not 100% sure the cause I did adjust dns & firewall settings in router unsure which if any was the culprit, possible it was an issue on the unraid end(?).
Hope it clears up Chris and anyone else that's happening to.