Hi folks,
I'm facing some troubles with mail server on a busy slow link.
I'm getting a lot of "sendmail: SYSERR: collect: read timeout on
connection from" entries in the logs.
I found this page showing an workaround for Solaris. Is it
applicable for Free BSD 5.4? If positive, is there any sysctl variable to
tun it?
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TCP/IP connections time out too soon, especially on slow links.
The tcp/ip abort interval in Solaris 2.x is too short, the default value
is 2 minutes. The result is that when an ACK isn't received in 2 minutes,
the connection is closed. This is most often seen by sendmail, which will
log
sendmail: SYSERR: collect: read timeout on connection from ...
You can fix this by running following command which increases the timeout
to 8 minutes (unit is millisec), which is the Solaris 2.4+ (and patched
2.3) default.
/usr/sbin/ndd -set /dev/tcp tcp_ip_abort_interval 480000
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- Marcelo
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