PING_EVENT: no pong

[Metin2KY 1]

I have problem with my metin2 server, after an hour working great the server crash.

I dont know what is the problem but in ch1 sysser i have that: 

Feb  7 23:59:31 :: PING_EVENT: no pong 95.21.225.457
Feb  7 23:59:31 :: SYSTEM: closing socket. DESC #19
Feb  7 23:59:47 :: SpawnMob: cannot create monster at non-exist sectree 405100 x 656600 (map 61)
Feb  7 23:59:53 :: SpawnMob: cannot create monster at non-exist sectree 1077300 x 2670500 (map 198)
Feb  7 23:59:56 :: PlayerCreate: name Ghost pos 0 job 0 shape 0
Feb  7 23:59:56 :: NewPlayerTable2(name=Ghost, race=0, job=0)
Feb  7 23:59:56 :: PlayerCreate: name Ghost account_id 0, TPlayerCreatePacketSize(1886), Packet->Gold 0
Feb  8 00:00:00 :: SYSTEM_CMD: rm -rf ./log/20160206
Feb  8 00:00:00 :: SYSTEM: LOG ROTATE (2016-02-08 23)

 

Any one know why?

Sorry for bad english.