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I want to connect to someone's PC using Remote Assistance in Microsoft Messenger. Both PCs run Windows 7. The remote user is the one initiating the request. We're both behind firewalls/routers which use NAT. My PC is set to be on a Public network, but I don't know that type of network the remote PC is on (Public, Home, or Private). I get this error after entering in the password:

Remote Assistance can't make the connection

Hitting "Troubleshoot" didn't help -- Windows couldn't find anything wrong.

I tried enabling UPnP on my router, but that didn't help. The remote router probably has UPnP enabled.

  1. Does Remote Assistance work over NAT?
  2. Does Remote Assistance work through firewalls?
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  1. No, unless you configure port forwarding
  2. Yes, but you have to open TCP 3389 port

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Hope to have been of help ;-)

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  • That article says that Remote Assistance works over NAT if at least one router supports UPnP, which is my case. Or, did I misunderstand that?
    – royco
    Oct 29, 2010 at 22:51
  • UPnP allows port forwarding, so case 1 is your case. But you might be under an ISP firewall. Can you ping your router from the external?
    – usr-local-ΕΨΗΕΛΩΝ
    Oct 29, 2010 at 23:40
  • The ISP lets everything through except port 80.
    – royco
    Oct 30, 2010 at 0:04
  • GoToAssist.com works fine. It's only Remote Assistance that doesn't work. Too bad GoToAssist.com is so expensive.
    – royco
    Oct 30, 2010 at 1:59

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