Up to now renewing certificates worked without problem. But the currently I get:
... error: one or more domains had a problem:\n[server.domain.de] acme: error: 400 :: urn:ietf:params:acme:error:connection ::
Fetching http:server.domain.de/.well-known/acme-challenge/................
Timeout during connect (likely firewall problem)\n" providerName=letsencrypt.acme
Maybe this is the result of adding country blocking rules.
So my question is: Who i.e. what server (name,IP) tries to fetch the challenge or where is it located?