HwKeeper
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At first, I thought it fixed itself, but it turns out it didn't. I logged in without my proxy, as usual.
Added after 11 hours and 41 minutes
"It didn't last long."
I restarted the proxy, and it seems to be working now.
It probably got overloaded with requests and couldn't handle it. We need to add bot protection to it, otherwise they will consume resources that should be available to players.