Syncing problem with network home folders

Deaar Community,
I recently obtained a Mac Mini Server. I had a problem syncing my iPhone after moving all my data to network home folders.
Everytime I got the following message:
"Syncing cannot be enabled on this computer"
"Multiple computers are logged in to this same network home folder."
"Please turn off syncing on all other computers..."
There were no other computers syncing into the same directory.
This turned out to be a wrong error message.
I solved the problem by turing off the firewall on the server.
That was strange. Although the firewall rules were set to allow all traffic within the local zone iTunes had a problem with its presence.

Please be also sure that the permissions for the files are set correctly. In my case it turned out that the permissions for the iTunes Library were set in a way that the directories were owned by the server administrator's account. I had to reset the owner.
I also feel that there is a bug in the permissions administration in snow leopard server. I ended up with files that had a lot of permissions entries which were completely identical.
i. e.
Angela read only
Steve read+write
Steve read+write
Steve read+write
everyone none
Stll, a different error occurs randomly, but I finally managed to completely sync the iPhone. The error message now says that the iPhone could not be synced because the sync server could not sync the iphone. (?! This is somewhat redundant.)

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