Thanks for answer but this wasn`t the problem ;-)
If i create in the ISPConfig a subdomain like "login.mydomain.com" and i want to access login.mydomain.com over https i don`t find a way to create this? Maybe if i buy a wildcard certificate for "*.mydomain.com" but this shouldn`t the solution.
I want to create a certificate for only my subdomain which i create over ISPConfig.
Any idea? Not possible? Feature request?