I parked the domain on the server where I have the DA and generated an SSL certificate for that domain. Then I moved the dns records (ftp, www, domain name) to another server. I am synchronizing a certificate between two servers based on Rsync and this solution work great. I have an issue when I want renew certificate because DA show error.
2023/07/12 00:26:33 [INFO] [ftp.domainname.com, mail.domainname.com, domainname.com, pop.domainname.com, smtp.domainname.com, www.domainname.com] acme: Obtaining SAN certificate
2023/07/12 00:26:34 [INFO] [ftp.domainname.com] AuthURL: https://acme-v02.api.letsencrypt.org/acme/authz-v3/XXXXXXXXXXXX
2023/07/12 00:26:34 [INFO] [mail.domainname.com] AuthURL:
2023/07/12 00:26:34 [INFO] [domainname.com] AuthURL: https://acme-v02.api.letsencrypt.org/acme/authz-v3/XXXXXXXXXXXX
2023/07/12 00:26:34 [INFO] [pop.domainname.com] AuthURL: https://acme-v02.api.letsencrypt.org/acme/authz-v3/XXXXXXXXXXXX
2023/07/12 00:26:34 [INFO] [smtp.domainname.com] AuthURL: https://acme-v02.api.letsencrypt.org/acme/authz-v3/XXXXXXXXXXXX
2023/07/12 00:26:34 [INFO] [www.domainname.com] AuthURL: https://acme-v02.api.letsencrypt.org/acme/authz-v3/XXXXXXXXXXXX
2023/07/12 00:26:34 [INFO] [mail.domainname.com] acme: authorization already valid; skipping challenge
2023/07/12 00:26:34 [INFO] [ftp.domainname.com] acme: Could not find solver for: tls-alpn-01
2023/07/12 00:26:34 [INFO] [ftp.domainname.com] acme: use http-01 solver
2023/07/12 00:26:34 [INFO] [pop.domainname.com] acme: authorization already valid; skipping challenge
2023/07/12 00:26:34 [INFO] [smtp.domainname.com] acme: authorization already valid; skipping challenge
2023/07/12 00:26:34 [INFO] [www.domainname.com] acme: Could not find solver for: tls-alpn-01
2023/07/12 00:26:34 [INFO] [www.domainname.com] acme: use http-01 solver
2023/07/12 00:26:34 [INFO] [domainname.com] acme: Could not find solver for: tls-alpn-01
2023/07/12 00:26:34 [INFO] [domainname.com] acme: use http-01 solver
2023/07/12 00:26:34 [INFO] [ftp.domainname.com] acme: Trying to solve HTTP-01
2023/07/12 00:26:48 [INFO] [www.domainname.com] acme: Trying to solve HTTP-01
2023/07/12 00:26:54 [INFO] [domainname.com] acme: Trying to solve HTTP-01
2023/07/12 00:27:01 [INFO] Skipping deactivating of valid auth: https://acme-v02.api.letsencrypt.org/acme/authz-v3/XXXXXXXXXXXX
2023/07/12 00:27:02 [INFO] Skipping deactivating of valid auth: https://acme-v02.api.letsencrypt.org/acme/authz-v3/XXXXXXXXXXXX
2023/07/12 00:27:02 [INFO] Skipping deactivating of valid auth: https://acme-v02.api.letsencrypt.org/acme/authz-v3/XXXXXXXXXXXX
2023/07/12 00:27:02 [INFO] Deactivating auth: https://acme-v02.api.letsencrypt.org/acme/authz-v3/XXXXXXXXXXXX
2023/07/12 00:27:02 [INFO] Deactivating auth: https://acme-v02.api.letsencrypt.org/acme/authz-v3/XXXXXXXXXXXX
2023/07/12 00:27:03 [INFO] Deactivating auth: https://acme-v02.api.letsencrypt.org/acme/authz-v3/XXXXXXXXXXXX
2023/07/12 00:27:03 Could not obtain certificates:
error: one or more domains had a problem:
[ftp.domainname.com] acme: error: 403 :: urn:ietfarams:acme:error:unauthorized :: XXX.XXX.XXX.XXX: Invalid response from https://domainname.com/: "
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