I had the same issue late afternoon yesterday. I resubmitted a couple of times, eventually I was successful and the problem went away. Haven't seen it since.
It seems all is Ok now.
AOU said there was an internet break down in Europe.
We're lucky POAL isn't under direct attack like VOAT experienced so often 2018-2021. DDoS, flood it with raunchy porn, every nasty thing they could do to disable VOAT. I've never seen anything like it before or since.
It actually is, but I use some custom protections. Our host also has an anti-DDoS later running.
Anyone with a little experience could take voat down. It was so poorly coded, they supposedly needed thousands of dollars per month to pay for a decent hosting that could handle the resources hungry code.
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