Firefox Sync cannot connect to server

Firefox Desktop 12.0 on Win7 HP 64bit
Firefox Mobile 14.0 on Android 4.0.3 (didn't work on 2.3.6 either)
Hello,
I'm trying to set up Sync between my Firefox Mobile and Desktop. On the mobile, I tap on "Sync" and get the three alphanumerical codes. I enter them on my desktop Firefox, the both browsers communicate with the server. The desktop browser says "Device connected" and the mobile browser says "Firefox Sync could not connect to server".
What else can I try?
Greetings, Jost

Do you have Firefox mobile Aurora or Nightly builds installed and Syncing? The rewrite as a Android Service resulted in Sync only working with one instance of Firefox at a time.

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