IE has started exhibiting a strange behavior. We have several intranet nodes (routers) that are configured to use HTTPS for access, but which have untrusted / self signed certificates on them. At some unidentifiable point in the recent past, there was no problem connecting to these devices. That is no longer true. When you attempt to connect, and choose option 3 ("to connect to the site anyways") IE comes back immediately with a "Connection Unavailable" screen. This occurs in IE8 and now (ugh) ie9.
Firefox has no problem connecting to these locations, which indicates that its not a TCP stack problem. Google Chrome fails to connect; but then Google Chrome fails at a lot of stuff.
We have tried adding them as trusted sites. No difference.
Clearly there is some obscure setting or MS has come out with a patch that breaks things. Any ideas?