"The certificate of the peer does not match the expected hostname"

[chwba]

How to fix "The certificate of the peer does not match the expected hostname"?

[EricLaw]

Where specifically are you seeing this message? The general complaint in the message is that the certificate (presumably the one generated by Fiddler) does not contain the fully-qualified domain name expected by the client application. Fiddler's certificate generator generates certificates that are valid under the applicable standards, so this sounds like something unusual in your scenario. What's the client app? Is the site reachable through Fiddler in a browser context? Do you have a SAZ file showing this?