ArcGIS Server Logs stop working

Discussion created by on Feb 25, 2014
Latest reply on Feb 25, 2014 by crafty762
We have been using ArcGIS Server Logs REST queries to parse logs from previous day. Queries works great for about 50 days in a row, but then is suddenly stops working and each query returns exactly the same result after exactly 10 minutes of execution. The result is: {"hasMore":false,"startTime":0,"endTime":0,"logMessages":[]}
If it's a sever issue, then I would expect REST error or timeout, but not an empty result. Server restart does not help and we can't even browse logs in the manager console (the loading query never ends). However we can see logs for last hour.
How can we restore log queries?