On Wed, May 29, 2002 at 04:33:34PM +0300, Tzafrir Cohen wrote:
> Hi
> 
> I noticed that my linux server was unable to connect to some remote smtp
> server. Simple 'telnet remoteserver 25' gives a timeout (no connection
> seems to be established). When I try to connect from some windows
> workstation I have no problem.

Broken firewalls blocking ECN? (Explicit Congestion Notification, see
http://www.icir.org/floyd/ecn.html. Recently became a standard). 

try "echo 0 > /proc/sys/net/ipv4/tcp_ecn", if ECN is indeed the problem. 
-- 
Sunday 7 Forelithe 7466

http://vipe.technion.ac.il/~mulix/
http://syscalltrack.sf.net/

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