Ah ok. Good to know.
In the meanwhile I figured out that I could call https://secure.phabricator.com/login/refresh/
maybe..
Although I must say you have a strange understanding of creating a json... (Just try that link ;)

um .. i tried, but there noone ever answers or reacts :/

Thank you for the response. Ok, I rechecked the logs and it was every 15 seconds - you are right. (I see 4 entries for each wrong location). There were 2 locations entered which were wrong at the same time. The repository is generally quite large.
Hm.
I can not completely exclude that the server's failure was something different.
But always when the synchronization started it didnt take long until the server said good bye.
Btw. the svn-log shows really tons of accesses during that time.