Hi stefano, thank you for the welcome
in my experience, if you use the FQDN of the server, you should get the certificate alert only on the first time..
With mozilla firefox, it works. (with IP or FQDN)
But with chromium (on linux) , there is a warning message in every restart (and the passwords are not registered)
Apparently, it is necessary to make some manipulation under Linux to accept Self-signed certificate. It works with one of my servers (proxmox ) but not with sme (see
https://code.google.com/p/chromium/wiki/LinuxCertManagement)
sme server and customers are in the local area
BTW, I come from France.