I have inactivated customer's website which had SSL set up. Since I removed checkmark from Active box, if I visit http://site1.com/ i get Account Suspended (works as expected). If I visit secure site (SSL) HTTPS https://site1.com/ I get one of my own sites. Anyone knows how to fix this issue?
Enable ssl for your default website, the one with the suspended message. But you will always get an ssl error then as the ssl cert of the default site will not match the one of your client site.