Problem with Issue the SSL by Let's Encrypt

In my server Let's Encrypt issue the SSL Cert often have the error like below:

Could not issue an SSL/TLS certificate for
Could not issue a Let's Encrypt SSL/TLS certificate for Authorization for the domain failed.

Invalid response from


Type: urn:ietf:params:acme:error:connection

Status: 400

Detail: During secondary validation: Fetching Timeout during connect (likely firewall problem)

I already checked the link verify is working around the world , the link

even I checked the log access in my server, have a record access by let's encrypt with status 200.

here is the log access in my server:

2022-07-29 07:11:12 GET /.well-known/acme-challenge/SItq48MB_BFmYpI5KDMLJ879GIZwDeN3UpTeu5Koz_4 X-ARR-CACHE-HIT=0&X-ARR-LOG-ID=3c7ecff0-81ba-4131-8242-dc8a664c1612&SERVER-STATUS=200 80 - HTTP/1.1 Mozilla/5.0+(compatible;+Let's+Encrypt+validation+server;++ - acme-challenge.localhost 200 0 0 501 269 617

I don't know why the verify link had been access by let encrypt but It can not issue the cert and raise the error timeout.

We perform validation from multiple locations. It looks like it succeeded from one location, but none of the others were able to connect. Do you have some sort of firewall that's blocking some IP addresses?


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