syncache_timer: errors; What do they mean?

David Southwell david at vizion2000.net
Mon Jan 11 10:51:59 UTC 2010


Here are some example entries in /var/log/messages (server ip address removed 
and replaced by [xxx.xxx.xxx.xxx] :

Can anyone please tell me what thses messages mean and what action (if any) I 
should be taking.
Thanks in advance for any replies
Jan 11 10:41:57 dns1 kernel: TCP: [113.53.173.247]:63584 to 
[xxx.xxx.xxx.xxx]:25; syncache_timer: Response timeout, retransmitting (1) 
SYN|ACK
Jan 11 10:42:01 dns1 kernel: TCP: [113.53.173.247]:63429 to 
[xxx.xxx.xxx.xxx]:25; syncache_timer: Response timeout, retransmitting (2) 
SYN|ACK
Jan 11 10:42:03 dns1 kernel: TCP: [113.53.173.247]:63584 to 
[xxx.xxx.xxx.xxx]:25; syncache_timer: Response timeout, retransmitting (2) 
SYN|ACK
Jan 11 10:42:13 dns1 kernel: TCP: [113.53.173.247]:63429 to 
[xxx.xxx.xxx.xxx]:25; syncache_timer: Response timeout, retransmitting (3) 
SYN|ACK
Jan 11 10:42:16 dns1 kernel: TCP: [113.53.173.247]:63584 to 
[xxx.xxx.xxx.xxx]:25; syncache_timer: Response timeout, retransmitting (3) 
SYN|ACK

David


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