1) Make sure that you use the latest ispconfig version (188.8.131.52)
i'm using 184.108.40.206 at the moment, but when run ispconfig_update.sh, got
"sh: update_from_tgz.sh: No such file or directory" error, why?
2) Check that you have not entered any special chars beside of a-z and 0-9 into the input firlds for the certificate details. Special chars might cause that openssl fails to create the ssl certificate.
it is empty in any of the certificate detail fields.