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


This command should be placed in a script rc2.d script. (See 3.20)


(See 5.21 for another possible cause)





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