Server: Ubuntu 18.04.2 LTS Bionic Beaver I am having strange error for one particular website, where Letsencrypt is not able to verify domain due to some reason, things I have tried so far are: - Domain correctly resolves to IP address using tools like mxtoolbox etc. - DNS settings are correctly pointing to IP's (IPV4 & IPV6) of my hosting (AAAA). - When running /usr/local/ispconfig/server/server.sh log, following output comes: Code: 25.02.2023-16:52 - WARNING - Could not verify domain liafi1964.in, so excluding it from letsencrypt request. 25.02.2023-16:52 - WARNING - Could not verify domain www.liafi1964.in, so excluding it from letsencrypt request. 25.02.2023-16:52 - WARNING - Let's Encrypt SSL Cert for: liafi1964.in could not be issued. - When checked SSL option - "Skip Lets Encrypt Check", following log comes: Code: Attached as txt file - Then from one of thread from forum I tried /usr/local/ispconfig/interface/acme/.well-known/acme-challenge/hello.txt - And I am able to see content of hello.txt using following URL : http://liafi1964.in/.well-known/acme-challenge/hello.txt Now I am lost, don't know whats going wrong with this domain. I have several domains with letsencrypt SSL running smoothly but this domain is not working. Any help please ?