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I've had a few goes at trying to set up wireless sync since I got my phone, but I get Error C00D07C9, with a message saying that:

Zune was unable to connect to the wireless access point.

Even though the laptop running Zune (on Windows Vista), and connected to the phone is quite happily connected to the access point (and onward to The Internet). I'm using a HTC Titan.

What might be causing this to not let me set up wireless sync?

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I have a Lumia 900 and I am having the same issue, I have even tried turning the firewall off completely and the error code still comes up, has anybody managed to fix this? –  user645 Sep 26 '12 at 9:26
    
I should also point out that I am using Windows 7, so this issue isn't just your HTC or Vista... –  user645 Sep 26 '12 at 9:29
    
I know your problem is with Windows Vista but you question indeed is not specific. So I want to share that in Windows 8 Zune WiFi sync does not work right now according to an MVP on Microsoft Answer. –  Vitor Canova Sep 27 '12 at 1:59

5 Answers 5

This might happen when you are on a network where some specific ports are blocked by the router or firewall. (common on public networks)

See also this microsoft support site

http://support.microsoft.com/kb/952304#method4

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My anecdote in support: I used to use ESET Smart Security for my firewall, and it was a hassle getting wireless sync set up using it. Since then, I've transitioned to the built-in Windows firewall and Microsoft Security Essentials, and Zune was able to autoconfigure it to let it through. Now I don't have any issues. –  Ben Richards Apr 30 '12 at 15:37
    
@GeertvdC It seems that the link you're referring to is dead. –  johnny Mar 30 at 16:28

According to this KB Article

Error C00D07C9
You may be connected to a Public-level network.

Resolution
This error can appear when the computer that Zune is installed on is connected to a Public network location. The Public network location blocks certain programs and services from running to help protect your computer from unauthorized access while you're connected to a network in a public place. If you're connected to a public network and Windows Firewall is turned on, some programs or services might ask you to allow them to communicate through the firewall so that they work properly.

If your computer is connected to a Public network this behavior is normal and you need to allow the Zune program and the Zune Wireless Configuration Service to communicate through your firewall. If your computer is actually connected to a network at work or at home (or a network you trust) then:

  1. Open the Network and Sharing Center by clicking the Start button, and then clicking Control Panel. In the Search box, type "network", and then click Network and Sharing Center.
  2. Click Public network and then click Work network or Home network.
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The network they're both on is a "private" (Home) network, so this workaround doesn't resolve my particular issue –  Rowland Shaw Apr 26 '12 at 20:32
    
Are you certain? The error number you provided says otherwise. If you are sure then check your firewall settings and make sure Zune is allowed to go out. –  Joe Apr 26 '12 at 20:34
    
Without knowing what firewall settings to check, that's a bit difficult; I allow the UAC prompt, so I would expect it to do all the right things (there are no third party firewalls installed) –  Rowland Shaw Apr 26 '12 at 20:38
    
I am on a corporate network right now, so this is coming from memory. Sorry if it is a tad wrong. 1. Open windows Firewall. 2. select "Allow a program or feature through" 3. if Zune is not selected in the list click "Add new", browse to the install folder and choose the exe. –  Joe Apr 26 '12 at 20:41
    
Like i said, that is from memory. Hopefully it will be close enough to at least let you see if zune is in the list. –  Joe Apr 26 '12 at 20:41

Answer for Windows 8:

I know your problem is with Windows Vista but you question indeed is not specific. So I want to share that in Windows 8 Zune WiFi sync does not work right now according to an MVP on Microsoft Answer. – Vitor Canova♦ Sep 27 '12 at 1:59

http://answers.microsoft.com/en-us/winphone/forum/wp7-sync/wireless-sync-windows-8-c00d07c9/8cfce655-18c7-4251-9031-861b1cce4dea?tm=1348710730023

As of May 2013, wireless sync of Windows Phone 7.8 with Zune in Windows 8 is still not possible.

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I had experienced the same issue, and after researching on this page http://support.xbox.com/en-AU/xbox-on-other-devices/windows-phone-7/wireless-sync you can see on section 'Compatible wireless networks' that states 'Zune players do not support the 802.11n standard.'

Since my network is 801.11n, I guess I won't be able to sync my phone...

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Also had the same problem, below solution solved it (taken from srndolha.wordpress.com/2014/03/12/resolved-c00d07c9-error-setting-up-zune-wireless-sync ):

On the Windows® Phone connected by USB cable to the computer (and having Zune software running): 1. Open Settings, select Internet Sharing and try to turn it on; it should respond with an error, as Internet connection sharing is not available while connected to the PC using a cable; ensure Internet Sharing is turned back off; 2. On the computer, go to Zune software application, select Settings and Wireless sync, and try setting it again: you may be surprised to have it working this time!

I’m not sure why Internet Sharing is involved (that’s what I called spectacular about this fix), but it surely resolves the problem!

Update: I found out that although the steps above might work on a Domain/Work network, the actual wireless sync process may not be run unless the network is Private/Home. And the limitation for 802.11n may still be in place.

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