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[Vitas <vitas@xxxxxx>]

Sorry of not fluently english...

This bug (or feature?) costs us 24 hours working in our routing center (2 Linux NAT boxes, 2 all-purpose Linux routers, ~ 15 VLANS),  beating heads to the wall, changing a half of VLANs structure, checking a half of switches and about 200 angry phone calls from customers :). The last day to holidays :). 
We think, the kernel 3.2.0-65 was made by Microsoft :). Reverting to 3.2.0-64 solved this NAT problems

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https://bugs.launchpad.net/bugs/1337281

Title:
  network problems after update to kernel 3.2.0-65 -
  thunderbird/imap/dovecot

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Since we installed the latest kernel update on our firewall this
  weekend (3.2.0-65.98) we got massive problems connecting from
  thunderbird (windows client) to an external imap-server (dovecot with
  tls). With our Linux client we got no problems.

  Opening or sending mails with attachments which was done in a second
  before the update, took  some minutes after the update to kernel
  3.2.0-65!

  Installing the kernel version 3.2.0-64 on our firewall system fixed
  the problem, also the newer kernel linux-generic-lts-trusty did fix
  the problem.

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