I've got similar log messages.
sep/15 23:55:51 ovpn,debug,error,63032,13296,13300,12024,31696,31260,12088,13296,l
2tp,info,13300,debug,79,65535,critical,32952,15944,37776,79,31336,40328,19200,4043
,30660,31260,54256,31260,warning unknown msg!
sep/15 23:55:52 ovpn,info TCP connection established from 162.142.125.194
sep/15 23:55:52 ovpn,info TCP connection established from 162.142.125.194
sep/16 06:40:02 ovpn,info TCP connection established from 68.183.40.229
sep/16 06:40:02 ovpn,info TCP connection established from 68.183.40.229
sep/16 06:40:04 ovpn,info TCP connection established from 68.183.40.229
sep/16 06:40:06 ovpn,info TCP connection established from 68.183.40.229
sep/16 06:40:08 ovpn,info TCP connection established from 68.183.40.229
sep/16 06:40:10 ovpn,info TCP connection established from 68.183.40.229
sep/16 06:40:12 ovpn,info TCP connection established from 68.183.40.22
sep/22 06:26:15 ovpn,info TCP connection established from 154.89.5.38
sep/22 06:26:15 ovpn,debug,error,63032,13296,13300,12024,31696,31260,12088,13296,l2tp,info,13300,debug,79,65535,critical,32952,15944,37776,79,31336,40328,19200,4043,30660,31260,54256,31260,warning msg too short
sep/22 06:26:31 ovpn,info TCP connection established from 154.89.5.21
sep/22 06:26:32 ovpn,info TCP connection established from 154.89.5.21
sep/22 06:26:32 ovpn,debug,error,63032,13296,13300,12024,31696,31260,12088,13296,l
2tp,info,13300,debug,79,65535,critical,32952,15944,37776,79,31336,40328,19200,4043,30660,31260,54256,31260,warning msg too short