I am using a pair of virtual servers running IIS 7. SSL 3.0 is disabled on both of them. FIrefox, starting with v37 is not allowing users to connect. Anybody else seeing this? EDIT: I am updating my question because it is sure to come up for others. To disable SSL 3.0 on IIS 7, I used this: https://www.digicert.com/ssl-support/iis-disabling-ssl-v3.htm It appeared not to work because firefox had cached the SSL version information and not just the cert. Clearing my cache fixed the problem. Unfortunately, this is going to continue to cause problems for my user base. It is a bad idea to use SSL 3.0. It is also a bad idea for FIrefox to cache the SSL version, IMHO, but there you go.