I'm writing here because i can't find any solution to my problem ...
I have a customer that is running an Exchange 2010 server with a NetASQ F200.
When files are attached to mails, and originating from a webmail of an ISP, there is no problem for the mail to arrive on the mailbox located on the Exchange 2010 server.
BUT !!!
When i try to send a mail from my Exchange server 2010 with the Astaro Security Gateway (up-to-date) to the Exchange 2010 server of my customer, each time i can see that there are errors.
Thanks for your help !
From now, i set the MTU of my DSL connection on the ASG to 1452, but i couldn't find where could i set the MSS setting on the ASG ?!
(CUSTOMER FIREWALL) NetASQ Monitor :
Bad TCP sequence number
Bad TCP sequence number (closed window)
(MY ASG FIREWALL) tcpdump :
STARTS HERE
10:15:35.803042 IP MY-IP.14014 > CUSTOMER-IP.25: S 1898941643:1898941643(0) win 8192
10:15:35.840326 IP CUSTOMER-IP.25 > MY-IP.14014: S 779058911:779058911(0) ack 1898941644 win 8192
10:15:35.840879 IP MY-IP.14014 > CUSTOMER-IP.25: . ack 1 win 257
10:15:35.881689 IP CUSTOMER-IP.25 > MY-IP.14014: P 1:101(100) ack 1 win 257
10:15:35.882739 IP MY-IP.14014 > CUSTOMER-IP.25: P 1:23(22) ack 101 win 256
10:15:35.928764 IP CUSTOMER-IP.25 > MY-IP.14014: P 101:268(167) ack 23 win 256
10:15:35.929751 IP MY-IP.14014 > CUSTOMER-IP.25: P 23:117(94) ack 268 win 255
10:15:35.968874 IP CUSTOMER-IP.25 > MY-IP.14014: P 268:313(45) ack 117 win 256
10:15:35.973250 IP MY-IP.14014 > CUSTOMER-IP.25: P 117:135(18) ack 313 win 255
10:15:36.214547 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 135 win 256
10:15:36.568711 IP MY-IP.14014 > CUSTOMER-IP.25: . 135:1535(1400) ack 313 win 255
10:15:36.851178 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 1535 win 257
10:15:36.851524 IP MY-IP.14014 > CUSTOMER-IP.25: . 2935:4335(1400) ack 313 win 255
10:15:36.851667 IP MY-IP.14014 > CUSTOMER-IP.25: . 4335:5735(1400) ack 313 win 255
10:15:36.938375 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 1535 win 257
10:15:36.938952 IP MY-IP.14014 > CUSTOMER-IP.25: . 1535:2935(1400) ack 313 win 255
10:15:36.938981 IP MY-IP.14014 > CUSTOMER-IP.25: . 4335:5735(1400) ack 313 win 255
10:15:36.939358 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 1535 win 257
10:15:37.031994 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 5735 win 257
10:15:37.032704 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 5735 win 257
10:15:37.350258 IP MY-IP.14014 > CUSTOMER-IP.25: . 5735:7135(1400) ack 313 win 255
10:15:37.623808 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 7135 win 257
10:15:37.624111 IP MY-IP.14014 > CUSTOMER-IP.25: . 11335:12735(1400) ack 313 win 255
10:15:37.624186 IP MY-IP.14014 > CUSTOMER-IP.25: . 12735:14135(1400) ack 313 win 255
10:15:37.710769 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 7135 win 257
10:15:37.711113 IP MY-IP.14014 > CUSTOMER-IP.25: . 7135:8535(1400) ack 313 win 255
10:15:37.711189 IP MY-IP.14014 > CUSTOMER-IP.25: . 8535:9935(1400) ack 313 win 255
10:15:37.711271 IP MY-IP.14014 > CUSTOMER-IP.25: . 9935:11335(1400) ack 313 win 255
10:15:37.711473 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 7135 win 257
10:15:37.798251 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 8535 win 257
10:15:37.812016 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 9935 win 257
10:15:37.812224 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 14135 win 257
10:15:38.130988 IP MY-IP.14014 > CUSTOMER-IP.25: . 14135:15535(1400) ack 313 win 255
10:15:38.408765 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 15535 win 257
10:15:38.409075 IP MY-IP.14014 > CUSTOMER-IP.25: . 19735:21135(1400) ack 313 win 255
10:15:38.409153 IP MY-IP.14014 > CUSTOMER-IP.25: . 21135:22535(1400) ack 313 win 255
10:15:38.502137 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 15535 win 257
10:15:38.502454 IP MY-IP.14014 > CUSTOMER-IP.25: P 15535:16935(1400) ack 313 win 255
10:15:38.502533 IP MY-IP.14014 > CUSTOMER-IP.25: . 16935:18335(1400) ack 313 win 255
10:15:38.502610 IP MY-IP.14014 > CUSTOMER-IP.25: . 18335:19735(1400) ack 313 win 255
10:15:38.503106 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 15535 win 257
10:15:38.590089 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 16935 win 257
10:15:38.604105 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 18335 win 257
10:15:38.604326 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 22535 win 257
10:15:38.912217 IP MY-IP.14014 > CUSTOMER-IP.25: . 22535:23935(1400) ack 313 win 255
10:15:39.179927 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 23935 win 257
10:15:39.180207 IP MY-IP.14014 > CUSTOMER-IP.25: . 28135:29535(1400) ack 313 win 255
10:15:39.180297 IP MY-IP.14014 > CUSTOMER-IP.25: . 29535:30935(1400) ack 313 win 255
10:15:39.267621 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 23935 win 257
10:15:39.267933 IP MY-IP.14014 > CUSTOMER-IP.25: . 23935:25335(1400) ack 313 win 255
10:15:39.268019 IP MY-IP.14014 > CUSTOMER-IP.25: . 25335:26735(1400) ack 313 win 255
10:15:39.268097 IP MY-IP.14014 > CUSTOMER-IP.25: . 26735:28135(1400) ack 313 win 255
10:15:39.274996 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 23935 win 257
10:15:39.357552 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 25335 win 257
10:15:39.371599 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 26735 win 257
10:15:39.371796 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 30935 win 257
10:15:39.678124 IP MY-IP.14014 > CUSTOMER-IP.25: . 30935:32335(1400) ack 313 win 255
10:15:39.953071 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 32335 win 257
10:15:39.955235 IP MY-IP.14014 > CUSTOMER-IP.25: . 36535:37935(1400) ack 313 win 255
10:15:39.955315 IP MY-IP.14014 > CUSTOMER-IP.25: . 37935:39335(1400) ack 313 win 255
10:15:40.039529 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 32335 win 257
10:15:40.039877 IP MY-IP.14014 > CUSTOMER-IP.25: P 32335:33735(1400) ack 313 win 255
10:15:40.039957 IP MY-IP.14014 > CUSTOMER-IP.25: . 33735:35135(1400) ack 313 win 255
10:15:40.040034 IP MY-IP.14014 > CUSTOMER-IP.25: . 35135:36535(1400) ack 313 win 255
10:15:40.040238 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 32335 win 257
10:15:40.109746 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 33735 win 257
10:15:40.130424 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 35135 win 257
10:15:40.150861 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 39335 win 257
10:15:40.459499 IP MY-IP.14014 > CUSTOMER-IP.25: . 39335:40735(1400) ack 313 win 255
10:15:40.746605 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 40735 win 257
10:15:40.746909 IP MY-IP.14014 > CUSTOMER-IP.25: . 44935:46335(1400) ack 313 win 255
10:15:40.746991 IP MY-IP.14014 > CUSTOMER-IP.25: . 46335:47735(1400) ack 313 win 255
10:15:40.833349 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 40735 win 257
10:15:40.833701 IP MY-IP.14014 > CUSTOMER-IP.25: . 40735:42135(1400) ack 313 win 255
10:15:40.833780 IP MY-IP.14014 > CUSTOMER-IP.25: . 42135:43535(1400) ack 313 win 255
10:15:40.833872 IP MY-IP.14014 > CUSTOMER-IP.25: . 43535:44935(1400) ack 313 win 255
10:15:40.834063 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 40735 win 257
10:15:40.921292 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 42135 win 257
10:15:40.929657 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 43535 win 257
10:15:40.929889 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 47735 win 257
10:15:41.224946 IP MY-IP.14014 > CUSTOMER-IP.25: . 47735:49135(1400) ack 313 win 255
10:15:41.511376 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 49135 win 257
10:15:41.511710 IP MY-IP.14014 > CUSTOMER-IP.25: . 53335:54735(1400) ack 313 win 255
10:15:41.511804 IP MY-IP.14014 > CUSTOMER-IP.25: . 54735:56135(1400) ack 313 win 255
10:15:41.602301 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 49135 win 257
10:15:41.602623 IP MY-IP.14014 > CUSTOMER-IP.25: P 49135:50535(1400) ack 313 win 255
10:15:41.602704 IP MY-IP.14014 > CUSTOMER-IP.25: . 50535:51935(1400) ack 313 win 255
10:15:41.602776 IP MY-IP.14014 > CUSTOMER-IP.25: . 51935:53335(1400) ack 313 win 255
10:15:41.603271 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 49135 win 257
10:15:41.670282 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 50535 win 257
10:15:41.691726 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 51935 win 257
10:15:41.691931 IP CUSTOMER-IP.25 > MY-IP.14014: . ack 56135 win 257
10:15:42.005877 IP MY-IP.14014 > CUSTOMER-IP.25: . 56135:57535(1400) ack 313 win 255
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