We have tested the kernel 3.19-rc7 and found some improvements.

Communication does not stop and the file can be finally downloaded, but
it still takes a long time.

We have tested a 100 MB file in an Ubuntu server with kernel 3.19-rc7 across 
the Cisco firewall changing sequence numbers with following results:
- With TCP SACK disabled (sysctl -w net.ipv4.tcp_sack=0)             62 seconds
- With TCP SACK enabled (default configuration)                         462 
seconds

It seems that, even though the communication is not completely stalled
with this kernel version, the problem is not solved yet.


** Tags added: kernel-bug-exists-upstream

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https://bugs.launchpad.net/bugs/1388786

Title:
  TCP stale transfer with erroneous SACK information

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