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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.

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First step would be to get alternative access to the machine ASAP. –  Oliver Salzburg Mar 19 '12 at 10:05
    
I already have it, of course. But thanks anyway. –  SoMoS Mar 19 '12 at 10:18
    
Have you rebooted? –  Harry Johnston Mar 20 '12 at 3:06
    
Lol, for sure that I did. But good remainder anyway. –  SoMoS Mar 20 '12 at 12:09
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2 Answers

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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I will check these things. ANyway I expected to find lots of people with the same problem but looks like I'm alone with this. –  SoMoS Mar 19 '12 at 11:12
    
Looking at my server the RDP port 3389 is not opened. The Terminal Services service is started and running. –  SoMoS Mar 19 '12 at 13:45
    
Anything in antivirus logs about quarantine and sandbox of possible trojan (or exclude terminal server executable from antivirus processing) –  ZaB Mar 19 '12 at 14:06
    
I don't have an antivius installed. –  SoMoS Mar 19 '12 at 14:13
    
so dig the log for windows firewall events. –  ZaB Mar 19 '12 at 15:42
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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.

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For future reference, you really should have mentioned that it wasn't a conventional Windows install. Virtuozo subverts the operating system in a way that seems likely to lead to all sorts of problems, including this one. (I presume it works well when used as designed, but it's not really Windows.) –  Harry Johnston Mar 20 '12 at 22:41
    
I agree, but I was not aware of this. I'm just renting a virtual server. –  SoMoS Mar 21 '12 at 9:55
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