Let's Encrypt challenge did not pass

Apps & App Center
#1

I’m trying to get a certificate from LE but the process fails: Challenge did not pass
I understood that the LE server tries to access the server on which I installed the LE app after ther certificate has been issued (via port 80). This somehow fails, the system says:

ValueError: Challenge did not pass for xxx.yyy.de: {u'status': u'invalid', u'challenges': [{u'status': u'invalid', u'validationRecord': [{u'url': u'http://xxx.yyy.de/.well-known/acme-challenge/XFgStRJ74aMvBQAH14QtjA7forH-TTU1SkFhluJskWc', u'hostname': u'xxx.yyy.de', u'addressUsed': u'82.xxx.66.0', u'port': u'80', u'addressesResolved': [u'82.xxx.66.0']}], u'url': u'https://acme-v02.api.letsencrypt.org/acme/chall/zzz/447233388375/jFzLgA', u'token': u'XFgStRJ74aMvBQAH14QtjA7forH-TTU1SkFhluJskWc', u'error': {u'status': 400, u'type': u'urn:ietf:params:acme:error:connection', u'detail': u'During secondary validation: 82.xxx.66.0: Fetching http://xxx.yyy.de/.well-known/acme-challenge/XFgStRJ74aMvBQAH14QtjA7forH-TTU1SkFhluJskWc: Timeout during connect (likely firewall problem)'}, u'validated': u'2024-12-19T11:15:38Z', u'type': u'http-01'}], u'identifier': {u'type': u'dns', u'value': u'xxx.yyy.de'}, u'expires': u'2024-12-26T11:15:36Z'}

I then connected my laptop with my phone’s hotspot and tried to access http://xxx.yyy.de/.well-known/acme-challenge/XFgStRJ74aMvBQAH14QtjA7forH-TTU1SkFhluJskWc, which produced a one line text file on my browser. This means to me that the necessary connection between the LE server and my UCS server should be available. So I don’t know why this error occurs.

Any ideas ?

#2

Ah yes: I tried this on two different servers at different locations …

#3

pls check

curl -v http://xxx.yyy.de/.well-known/acme-challenge/XFgStRJ74aMvBQAH14QtjA7forH-TTU1SkFhluJskWc 
and your apache2 Error Log

Which firewall do  you use in front of your server
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