On Wed, 20 Jan 2010 07:20:01 -0500 (EST), wie...@porcupine.org (Wietse Venema) wrote: > Martijn de Munnik: >> Hi list, >> >> I have a problem with delivering mail to a host and get this error: >> >> host mx2.amsterdam.nl[145.222.14.10] said: 421 enepmx02.amsterdam.nl >> Error: timeout exceeded (in reply to end of DATA command) >> >> This error only seems to occur with 'large' mails. Currently I have a >> mail >> of ~600KB and ~8MB stuck in the queue. I don't think this is a postfix >> issue on our site but an issue with the mailserver on the other site. >> What >> can cause such issues? > > Record a tcpdump trace. The way the session fails will indicate > the kind of problem (MTU, Window scaling, and so on). > > http://www.postfix.org/DEBUG_README.html > > Wietse
Ok, I tried that and I'm not really sure where to look for. I opened the tcpdump file in wireshark and there are a lot of warnings and notes in the file. -- Notes: Duplicate ACK(#1) [145.222.14.10 -> 213.207.90.2] Duplicate ACK(#2) [145.222.14.10 -> 213.207.90.2] Duplicate ACK(#3) [145.222.14.10 -> 213.207.90.2] Duplicate ACK(#4) [145.222.14.10 -> 213.207.90.2] . . . Duplicate ACK(#44) [145.222.14.10 -> 213.207.90.2] Retransmission (suspected) [213.207.90.2 -> 145.222.14.10] Warnings: Fast retransmission (suspected) [213.207.90.2 -> 145.222.14.10] Out-Of-Order segment [213.207.90.2 -> 145.222.14.10] -- This is abracadabra for me ;) Martijn -- YoungGuns Kasteleinenkampweg 7b 5222 AX 's-Hertogenbosch T. 073 623 56 40 F. 073 623 56 39 www.youngguns.nl KvK 18076568
