You're not alone on this. I have been getting the same thing every now and then.
I use my mobile phone's hotspot and sometimes I get the 'No Proxies Error' myself sometimes , Not as frequent but it still happens , unexpected too & I'll be still using my mobile hotspot. . . . I've switched over ( between different mobile hotspots , internet, whatever you want to call it ) and the issue will either still be there or it'll go away. I've looked this issue up myself and my friends suggested I did what you've already done ( checking the settings , LAN Proxy , etc ) and even then it doesn't help. I think it could be just a false error a very small bug with the signal of sorts because sometimes it can last for a few hours before everything happens again. Not entirely sure if this is something that should be alarmed about , but that's what I think. Of course , I could be wrong and someone might have a better explanation for this.
So heads and tails on this one, could be site itself , the internet , or simply both. Just be patient with it and the issue might go away eventually. If restarting the modem , internet .... doesn't help then as stated before , get help or simply be patient.
Hope this helped a little.
Not a problem~!
And I'm glad that it's at least working to some standards and it's not weird that you don't have a cellular hotspot. I only have one because I don't really 'have' an actual internet yet. But I'm glad the info helped you out a little.
My advice though, is to keep looking into this, I'm still looking into this myself , as well as checking with your internet provider.
Wish you luck though, Necro ^^