IOS device does not appear in WIFI sync in iTunes

It's been six years now that I had inserted the persistent ID of my main computer into iTunes of my second computer in the iTunes Library.xlm and iTunes Library.itl. So I could also copy content of the second computer via USB to the IOS device. Wi-Fi sync was ONLY activated on the main computer.This has worked for a long time, until:
Wireless sync: After a certain update of OSX or iTunes in the past, the IOS devices no longer appeared in the main computer in the sidebar of iTunes.
Now I wanted to undo the whole thing. The recovery of the original persistent ID of the second computer did not work. It was constantly reconstructing the persistent ID of the main computer.
I have now reinstalled iTunes, created a new iTunes library and re-imported the audio / video data. iTunes Library now also has a new persistent ID.
Unfortunately, it still does not work. Only when I turn off the second computer and reboot the main computer, the IOS devices via Wi-Fi sync appear in the sidebar of the main computer. Once the second computer is back online, the devices disappear from the sidebar.
Console reported besides others duplicate entries in the application (i.e. MUX ID not found in directory mapping)
The second computer must have noticed somewhere that iOS devices have been connected with it. But where?
Who can help?
PS: system on both machines = OS 10.9.4, iTunes 11.4

Heureka! since iTunes update 12.0.1 everything is working flawlessly

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