programming.dev has been unavailable a couple of times recently, that's what is probably happening.
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There’s an issue out for it, but mod actions like banning users pretty much brings instances to their knees, especially when the user has done a lot, and propagating it to the fediverse causes those instances to have the problem too.
I had this same problem, after clearing my Jerboa data it worked fine. Hope that helps
I’m working on a client and have noticed programming.dev has issues with login fairly frequently, while other instances like lemm.ee and lemmy.world do not. It only happens per-IP address so it might have something to do with rate limiting or blocking suspicious clients that connect. Hopefully this can be fixed down the road.