Nagios 2.1 have stopped some times. Last entry in log till it stops - SERVICE FLAPPING ALERT: grep -B 1 "2.1 starting..." /var/log/nagios/nagios.log [1143723946] SERVICE FLAPPING ALERT: _net-n-liepaja-srv;DISK C: free space;STARTED; Service appears to have started flapping (20.5% change >= 20.0% threshold) [1143790405] Nagios 2.1 starting... (PID=6671) -- [1143792340] SERVICE FLAPPING ALERT: _net-n-liepaja-srv;DISK C: free space;STARTED; Service appears to have started flapping (21.1% change >= 20.0% threshold) [1143792757] Nagios 2.1 starting... (PID=11656) -- [1143793487] SERVICE FLAPPING ALERT: _net-n-liepaja-srv;DISK C: free space;STARTED; Service appears to have started flapping (21.6% change >= 20.0% threshold) [1143793561] Nagios 2.1 starting... (PID=24024) -- [1143794252] SERVICE FLAPPING ALERT: _net-n-liepaja-gw;PING gateway;STARTED; Service appears to have started flapping (24.2% change >= 20.0% threshold) [1143794282] Nagios 2.1 starting... (PID=2723) -- [1143795613] SERVICE FLAPPING ALERT: _net-n-liepaja-srv;DISK C: free space;STARTED; Service appears to have started flapping (21.3% change >= 20.0% threshold) [1143795722] Nagios 2.1 starting... (PID=27191) Nagios itself starts flapping ;) <div id="sig"> </div>