IIS 7.0: Why does Require Client Certificates cause error 500 and "page cannot be displayed"

Solution 1:

The solution can be found here and is related to MS KB977377. The choices are

  • Remove MS update KB977377

or

  • Change the vlaue of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\DisableRenegoOnServer to 0