Question

I developed a ASP.NET application that needs to run in multiple instances on my machine (IIS7). I need to set up SSL for each instance, but I lose the option to do binding to a specific host name (that option is only available with regular HTTP). So how do I differentiate the instances?

If I try to add more than 1 SSL binding I get the error “At least one other site is using the same HTTPS binding and the binding is configured with a different certificate (…)”.

What to do?

Answer 1

The hostname information is part of the http headder, which is encrypetd (and decrypted) by SSL, so in order to have several SSL websites you have to do either:

• Use a wildcard certificate on all websites and use a hostheadder to route to the correct one:
  Example: Certificate for *.foo.com
  Sites: bar.foo.com and main.foo.com and void.foo.com

Or bind each certificate to its own IP

Or… Use SSL Termination from an accelerator device (ISA Server etc)