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Hi again I have a new router and ISP now. Would you be able to organise a test email for me, with these things switched back on, so I can see if it's cured the problem? Thanks for your help! Steve > Simon Waters wrote: >> The problem is that connections to "nonexistence.co.uk", which set the >> flags for "explicit congestion notification" (tcp_ecn) are being >> dropped. >> >> This draft IETF draft from 2001 suggests this is a "bad idea": >> >> http://www.icir.org/floyd/papers/draft-floyd-tcp-reset-00.txt >> >> ...but they would say that as they are the guys who invented ECN ;) >> >> Since I doubt we are the only email server you'll want email from which >> sets these flags, I suggest you check firewall/firmware revisions as >> appropriate. >> >> I've switched ECN off on the box I use as an email server -- but I >> haven't added it to /etc/sysctl.conf, so come the next reboot..... >> >> Simon >> -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html