Maurico/Ianmm - do not despair. I can confirmed there is simply no 'advanced settings' and I also get this error C00D07C9. I'm using a Samsung Focus WP7 attempting to wirelessly sync to my Dlink DGL4500; every attempt resulted in C00D07C9.
I've followed all instructions here but still failed - http://www.zune.net/en-US/support/webhelp/C00D07C9.htm?&webhelp_mpver=4.7.1404.0&webhelp_id=C00D07C9&webhelp_contextid=0&webhelp_originalid=C00D07C9&webhelp_locale=en-US
But I've finally got it working! Thanks to Ianmm 'out-of-the-box' thinking... it's indeed the LAN vs WLAN although I still can't figure out why it matters! Both your PC and WP7 need to be on the same SSID to work! Yes, both must be connected wirelessly!
Screenshots confirming no 'advanced settings' and successful setup - http://cid-15d8ec2e75e029b4.photos.live.com/browse.aspx/Public
It took me a while to finally witness the wireless sync in action. Hence note the following once you've successfully setup wireless sync. It cannot be manually triggered. You'll know you're on the right path when your desktop automatically install the device
driver (only happens after disconencting the sync cable from your desktop)
After you've completed the steps above, files will automatically sync to your phone wirelessly when the following conditions are met:
• Your phone and PC are both connected to your home Wi-Fi network. Note that wireless sync is not supported on workplace Wi-Fi networks.• Your phone battery has at least a medium-level charge ( ) and your phone is connected to an AC power adapter (that is, your phone must be connected to the wall charger and not connected to your computer).• You're not interacting with your phone. For example, you're not touching things on the screen, the backlight is off, and music and videos aren't playing (it's OK if a song or video is paused).
It might take up to 15 minutes for wireless sync to start, and there is no way to manually force it to occur. (extracted from -http://www.microsoft.com/windowsphone/en-us/howto/wp7/music/sync-files-with-my-phone.aspx)