主机：CentOS 版本 6.8（最终版）
服务器每天都会冻结，通常是凌晨 5 点左右。我无法登录终端，并且 Apache 网站无法访问。
终端显示以下屏幕：
最后登录 /var/logs/messages。该问题是否与 cpanel 和/或 pure-ftpd 有关？
Sep 16 05:20:11 cpanel02 lfd[4548]: SYSLOG check [yyx5o4oClslObXL]
Sep 16 05:20:32 cpanel02 kernel: [161487.262762] Firewall: *UDP_OUT Blocked* IN= OUT=eth0 SRC=192.168.214.22 DST=5.9.124.53 LEN=191 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=33282 DPT=24441 LEN=171 UID=0 GID=0
Sep 16 05:20:34 cpanel02 pure-ftpd: ([email protected]) [INFO] New connection from 127.0.0.1
Sep 16 05:20:34 cpanel02 pure-ftpd: ([email protected]) [INFO] __cpanel__service__auth__ftpd__wnN9amQ1oxAGrn6WrdHNL1rXSkYwQ4wsRStiOtyrYRodnvmU0JQ9JiEe3113xkDw is now logged in
Sep 16 05:20:34 cpanel02 pure-ftpd: (__cpanel__service__auth__ftpd__wnN9amQ1oxAGrn6WrdHNL1rXSkYwQ4wsRStiOtyrYRodnvmU0JQ9JiEe3113xkDw@127.0.0.1) [INFO] Logout.
Sep 16 05:25:33 cpanel02 kernel: [161788.373406] Firewall: *UDP_OUT Blocked* IN= OUT=eth0 SRC=192.168.214.22 DST=5.9.124.53 LEN=192 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=34193 DPT=24441 LEN=172 UID=0 GID=0
Sep 16 05:25:35 cpanel02 pure-ftpd: ([email protected]) [INFO] New connection from 127.0.0.1
Sep 16 05:25:35 cpanel02 pure-ftpd: ([email protected]) [INFO] __cpanel__service__auth__ftpd__Lcv6XAStC8q6sSKCi6qb6O4ipL63PO4e3VCNOhdcxXpAjA1FGaPSu2I1OM1nXSlw is now logged in
Sep 16 05:25:35 cpanel02 pure-ftpd: (__cpanel__service__auth__ftpd__Lcv6XAStC8q6sSKCi6qb6O4ipL63PO4e3VCNOhdcxXpAjA1FGaPSu2I1OM1nXSlw@127.0.0.1) [INFO] Logout.
Sep 16 05:30:12 cpanel02 lfd[4548]: SYSLOG check [xfL4KehGAgdKefc8]
Sep 16 05:30:35 cpanel02 kernel: [162089.570555] Firewall: *UDP_OUT Blocked* IN= OUT=eth0 SRC=192.168.214.22 DST=5.9.124.53 LEN=191 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=53415 DPT=24441 LEN=171 UID=0 GID=0
Sep 16 05:30:36 cpanel02 pure-ftpd: ([email protected]) [INFO] New connection from 127.0.0.1
Sep 16 05:30:36 cpanel02 pure-ftpd: ([email protected]) [INFO] __cpanel__service__auth__ftpd__1pmBiVuVLkyHFRZMAfB9aGpX5Z0akRMPNd0Wp9l49I6Raa6Dcp5C0YpI3V2js2sn is now logged in
Sep 16 05:30:36 cpanel02 pure-ftpd: (__cpanel__service__auth__ftpd__1pmBiVuVLkyHFRZMAfB9aGpX5Z0akRMPNd0Wp9l49I6Raa6Dcp5C0YpI3V2js2sn@127.0.0.1) [INFO] Logout.