After applying the MS12-020 fix this morning (as it seemed a real big issue) I'm not able to remote connect to the server anymore. The RDP client timeouts and nothing is logged on the server.
Since the binary file is modified, it might be Windows Firewall not catching up with the new checksum, or the AV sandboxing perceived a backdoor on your system.
MS12-20 also changes RDP registry, thus you might need to redo your configuration anew.
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In the end it was related with the remote server being virtualized by Parallels Virtuozo. Looks like you cannot update the system without updating the host first.
That's all I can say 'cos the details are only known by my virtual server provider.