저의 서버가 왜 죽죠?

저는 수세리눅스 9.3을 웹서버로 사용하고 있습니다. 서버관리 실무바이블2.0과 실무명령어 바이블을 참고하여 초보지만 나름대로 열심히 하고 있습니다.

그런데 비정기적으로 서버가 다운이 됩니다. 방화벽을 나름대로 잘 설정하여 사용중이구요, 서버관리하시는 분도 로그파일을 나름대로 세밀히 분석해 보시더니 하드웨어적으로 문제가 있거나 특별히 문제될만한 내용이 없다고 합니다.

단, /var/log/warn 파일을 보면 src ip로부터 많은 로그들이 싸입니다. 그런데 그 로그를 초보인 저로서는 이해할 수가 없네요~

로그파일일부분을 올립니다. 고수님들의 조언 부탁드립니다.

Dec  8 04:15:36 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.147.172 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=122 ID=56061 DF PROTO=TCP SPT=3521 DPT=135 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:15:39 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.147.172 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=122 ID=56409 DF PROTO=TCP SPT=3521 DPT=135 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:16:25 greatearth kernel: SFW2-INext-ACC-TCP IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=211.195.53.224 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=116 ID=47227 DF PROTO=TCP SPT=2620 DPT=25 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:16:56 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.115.138 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=122 ID=58559 DF PROTO=TCP SPT=2656 DPT=139 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:16:59 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.115.138 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=122 ID=60105 DF PROTO=TCP SPT=2656 DPT=139 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:17:10 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.171.35 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=121 ID=9722 DF PROTO=TCP SPT=4507 DPT=135 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:17:13 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.171.35 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=121 ID=12055 DF PROTO=TCP SPT=4507 DPT=135 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:18:08 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.221.67 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=118 ID=55330 DF PROTO=TCP SPT=1248 DPT=139 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:18:10 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.221.67 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=118 ID=56887 DF PROTO=TCP SPT=1248 DPT=139 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:19:02 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.172.27 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=121 ID=5923 DF PROTO=TCP SPT=3550 DPT=135 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:19:05 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.172.27 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=121 ID=6125 DF PROTO=TCP SPT=3550 DPT=135 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:19:09 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=198.104.137.161 DST=220.124.142.202 LEN=501 TOS=0x00 PREC=0x00 TTL=50 ID=0 DF PROTO=UDP SPT=42054 DPT=1026 LEN=481
Dec  8 04:19:09 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=198.104.137.161 DST=220.124.142.202 LEN=501 TOS=0x00 PREC=0x00 TTL=50 ID=0 DF PROTO=UDP SPT=42054 DPT=1027 LEN=481
Dec  8 04:20:04 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.171.35 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=121 ID=61890 DF PROTO=TCP SPT=1878 DPT=135 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:20:07 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.171.35 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=121 ID=64265 DF PROTO=TCP SPT=1878 DPT=135 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:21:00 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.174.202 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=121 ID=61323 DF PROTO=TCP SPT=3299 DPT=135 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:21:03 greatearth kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=220.124.174.202 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=121 ID=62246 DF PROTO=TCP SPT=3299 DPT=135 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)
Dec  8 04:21:27 greatearth kernel: SFW2-INext-ACC-TCP IN=eth0 OUT= MAC=00:04:23:b0:95:86:00:01:30:0a:c0:00:08:00 SRC=211.195.53.224 DST=220.124.142.202 LEN=48 TOS=0x00 PREC=0x00 TTL=116 ID=41780 DF PROTO=TCP SPT=1835 DPT=25 WINDOW=64240 RES=0x00 SYN URGP=0 OPT (020405B401010402)