I was looking for information about this error but I am not sure what is happening. I have the subdomain (mail.doamin.com) added with ISPConfig all right with the certificates, But the main domain (domain.com) was unused, it only has "We are in maintenance" information but it had no certificate or https. Then go to Sites - Add website Server: mail.domain.com Domain: domain.com Auto-Subdomain: None SSL: enabled Let's Encrypt SSL: enabled PHP: disabled Redirection: Rewrite HTTP to HTTPS: enabled Fail2ban gives the following warning: WARNING Determined IP using DNS Lookup: domain.com = ['203.456.xx.xx'] What error have I made when adding the primary domain to ISPConfig? -------------------------------------------------- ---------------------------------- I also want to take this opportunity to ask about this warning: Expand: Mail warning logs Feb 23 19:11:44 mail postfix/smtpd[2907]: warning: hostname zg0213a-232.stretchoid.com does not resolve to address 172.21.232.127: Name or service not known Feb 23 20:09:35 mail postfix/smtps/smtpd[5215]: warning: hostname zg0213a-376.stretchoid.com does not resolve to address 12.243.13.139: Name or service not known Feb 23 20:09:35 mail postfix/smtps/smtpd[5215]: warning: TLS library problem: error:1408F10B:SSL routines:ssl3_get_record:wrong version number:../ssl/record/ssl3_record.c:332: Feb 23 20:34:33 mail postfix/submission/smtpd[5914]: warning: hostname zg0213a-190.stretchoid.com does not resolve to address 12.21.226.132: Name or service not known Feb 23 21:10:00 mail postfix/smtps/smtpd[7602]: warning: hostname zg0213a-315.stretchoid.com does not resolve to address 12.243.129.51: Name or service not known Feb 23 21:10:00 mail postfix/smtps/smtpd[7602]: warning: TLS library problem: error:1408F10B:SSL routines:ssl3_get_record:wrong version number:../ssl/record/ssl3_record.c:332: Feb 23 21:35:45 mail postfix/submission/smtpd[8375]: warning: hostname zg0213a-128.stretchoid.com does not resolve to address 12.21.221.42: Name or service not known Feb 23 22:13:04 mail postfix/smtps/smtpd[10064]: warning: hostname zg0213a-140.stretchoid.com does not resolve to address 12.21.21.239: Name or service not known I am ignoring them, but there are many every day and the vast majority correspond to the IP of the VPS provider where I am testing. I ignore them? Thanks
