Did you try paru instead of yay? They should both work, but maybe paru shows a different output?
paru:
:: Looking for PKGBUILD upgradesā¦
:: Looking for AUR upgradesā¦
:: Looking for devel upgradesā¦
error: error sending request for url (``https://aur.archlinux.org/rpc``): error trying to connect: unexpected EOF
edit: different output indeed
Your yay and paru are not working, here they both work.
Not sure why, but could be many reasons.
Can you see the AUR page with a web browser?
plot thickens:
The connection has timed out
The server at aur.archlinux.org is taking too long to respond.
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The site could be temporarily unavailable or too busy. Try again in a few moments.
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If you are unable to load any pages, check your computerās network connection.
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If your computer or network is protected by a firewall or proxy, make sure that LibreWolf is permitted to access the web.
āboth browsers
Are you on a VPN? If so try without it.
itās like Iām on some sort of sh%#list, my tinfoil voice tells me
Looks like you may have an ISP issue of some sort. Or a VPN?
no vpn. librewolf stock and stock firewalld
same mullvad
same result chromium
Is your router fully updated and otherwise OK?
Oh boy that would be weird
Have you tried restarting your router?
can always reboot that later and report back (wife is working and will kill me literally..)
What dns servers are you using?
whats the best way to find out?
Better not disturb your wifeā¦ 
Itās like you know herā¦
Some time ago someone posted a problem with his ISP because the ISP had changed the DNS server and forgot to update his router with the new settings.
I just look in my network connections widget
holy crap that was there in taskbar 5 minutes agoā¦.wth
192.168.0.1 is primary dns