If you encounter this problem under the above named circumstances and get a message like:
Internet Explorer was unable to open this site. The requested site is either unavailable or cannot be found. Please try again later.
you should follow this workaround:
Depending on what version of IE you have make the additional entry to the registry. In our case the following helped:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings (for the user) or
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings (for the computer)
add a new value "BypassSSLNoCacheCheck"=Dword:00000001