[CentOS] SFTP - stalled - on large files
Jay Leafey
jay.leafey at mindless.com
Wed Dec 23 00:41:36 UTC 2009
We had a similar problem copying files between servers on two of our
campuses via SCP. After a while the connection just stalled out and
hung. The problem turned out to be SCP and SFTP interacting a bug in
the SACK (Selective Acknowledgment) algorithm used in Linux. We turned
it off on the two endpoints using the following addition to
/etc/sysctl.conf:
> # Turn off SACK
> net.ipv4.tcp_sack = 0
and execute "sysctl -p" to apply it. You can also use "sysctl -w
net.ipv4.tcp_sack=0" to turn it off temporarily. Our file transfers
worked just fine after the change.
I realize there are differences our situation and yours and this might
not work in your case. Given the length of this thread, though, it
might be worth a try!
--
Jay Leafey - Memphis, TN
jay.leafey at mindless.com
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