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[grufo <1337281@xxxxxxxxxxxxxxxxxx>]

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Maybe this could help a litte bit...:?
Two times seq 1984 with same chksum - is that normal?

09:11:16.453942 IP (tos 0x0, ttl 127, id 9250, offset 0, flags [DF], proto TCP (6), length 114)
    192.168.98.7.53479 > 192.168.1.21.993: Flags [P.], cksum 0x04c1 (correct), seq 1910:1984, ack 19602, win 16286, length 74
09:11:16.467028 IP (tos 0x0, ttl 127, id 9284, offset 0, flags [DF], proto TCP (6), length 162)
    192.168.98.7.53479 > 192.168.1.21.993: Flags [P.], cksum 0xdabb (correct), seq 1984:2106, ack 19692, win 16263, length 122
09:11:16.773648 IP (tos 0x0, ttl 127, id 9452, offset 0, flags [DF], proto TCP (6), length 162)
    192.168.98.7.53479 > 192.168.1.21.993: Flags [P.], cksum 0xdabb (correct), seq 1984:2106, ack 19692, win 16263, length 122
09:11:16.774403 IP (tos 0x0, ttl 127, id 9453, offset 0, flags [DF], proto TCP (6), length 52)
    192.168.98.7.53479 > 192.168.1.21.993: Flags [.], cksum 0x9c66 (correct), seq 2106, ack 19692, win 16263, options [nop,nop,sack 1 {25532:26980}], length 0
09:11:16.775437 IP (tos 0x0, ttl 127, id 9454, offset 0, flags [DF], proto TCP (6), length 52)
    192.168.98.7.53479 > 192.168.1.21.993: Flags [.], cksum 0x9610 (correct), seq 2106, ack 21152, win 16425, options [nop,nop,sack 1 {25532:26980}], length 0
09:11:16.776425 IP (tos 0x0, ttl 127, id 9455, offset 0, flags [DF], proto TCP (6), length 52)
    192.168.98.7.53479 > 192.168.1.21.993: Flags [.], cksum 0x905c (correct), seq 2106, ack 22612, win 16425, options [nop,nop,sack 1 {25532:26980}], length 0
09:11:16.777020 IP (tos 0x0, ttl 127, id 9456, offset 0, flags [DF], proto TCP (6), length 52)
    192.168.98.7.53479 > 192.168.1.21.993: Flags [.], cksum 0x8e54 (correct), seq 2106, ack 22612, win 16425, options [nop,nop,sack 1 {25532:27500}], length 0
09:11:16.777792 IP (tos 0x0, ttl 127, id 9457, offset 0, flags [DF], proto TCP (6), length 52)
    192.168.98.7.53479 > 192.168.1.21.993: Flags [.], cksum 0x88a0 (correct), seq 2106, ack 24072, win 16425, options [nop,nop,sack 1 {25532:27500}], length 0
09:11:16.778118 IP (tos 0x0, ttl 127, id 9458, offset 0, flags [DF], proto TCP (6), length 40)
    192.168.98.7.53479 > 192.168.1.21.993: Flags [.], cksum 0x0acb (correct), seq 2106, ack 27500, win 16425, length 0
09:11:16.859798 IP (tos 0x0, ttl 127, id 9472, offset 0, flags [DF], proto TCP (6), length 114)
    192.168.98.7.53479 > 192.168.1.21.993: Flags [P.], cksum 0x182a (correct), seq 2106:2180, ack 27500, win 16425, length 74
09:11:17.060652 IP (tos 0x0, ttl 127, id 9684, offset 0, flags [DF], proto TCP (6), length 40)
    192.168.98.7.53479 > 192.168.1.21.993: Flags [.], cksum 0x0a4a (correct), seq 2180, ack 27574, win 16406, length 0

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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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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