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So I got a warning that nginx proxy manager hadn't been renewing my certificates for a while tonight.
(thegoatery.dyndns.org)
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Try turning off "force SSL" "HTTP/2" and "HSTS" then try to renew. If that works it's a known bug and there's a fix in this thread:
https://github.com/NginxProxyManager/nginx-proxy-manager/issues/396#issuecomment-1694749898