We have many sites on one IP. At the time of transferring from one IP to another IP, I started generating certificates without completely transferring all sites to a new IP and as a result, all new requests gave an error: return code: 403 Details: Invalid response from http://zhk-vyshe.ru/.well-known/acme-challenge/gKgqanU3c-lhpDTR-7XRjlaQNK3_B-Bso-F5FlJ5Ig8 [46.254.20.222]: "\r\n\r\n\r\n\t\r\n\t\r\n\t
I deleted all redundant certificates and completed the transfer of sites to a new IP (37.143.12.120).
Could you please unblock our IP address 37.143.12.120?
Yes, but now when creating a new certificate, I just get a message: The process of obtaining a certificate has begun. And that’s all, nothing else is happening.
Let’s Encrypt does not have an IP block for any of the IP addresses listed in previous comments. From our edge perspectives I am able to successfully traceroute to your domain.
Today at 16:30:08 the status appeared. The process of obtaining a certificate has begun. And no more changes.
Technical support writes - “CSR generated and sent. There is no response from the certification authority yet. We must expect an answer from them.”
According to logs, the last validation attempt for www.zhk-vyshe.ru happened on July 11th, 2019 and each attempt that day did not succeed. I also do not see any previous certificate issuances from any CA according to https://crt.sh/?q=www.zhk-vyshe.ru. I’m not exactly sure what that technical support person actually did or who they sent a CSR to, but server logs show by omission that it was not to Let’s Encrypt.
What are some of the other domains you were able to successfully issue a Let’s Encrypt certificate for?
I agree with @JuergenAuer that this sounds like an issue with ISPmanager.