Hello
Marc Stein (<[EMAIL PROTECTED]>) wrote:
> This is a really bizarre situation. I have not been able to send mail
> to a specific Windows mail server at cw2.coreweb.com from a Postfix
> server on Debian.
>
> I cannot telnet to port 25 on the Windows machine from any Debian box
> that I have. I can telnet to the machine from Red Hat and Windows
> machines. When I send a telnet request from the Debian box I don't get
> a reply and the telnet request times out.
>
> What makes this particularly puzzling (to me, at least) is that the
> Debian, Red Hat, and Windows boxes that I try to telnet from can all
> be in the same subnet so it doesn't seem that it could be a firewall
> issue on the other end.
>
> An example follows:
>
> [...]
> 28903 2.336422 linux-dev.y2m.com -> cw2.coreweb.com TCP 33038 >
> telnet [SYN, ECN, CWR] Seq=3827497024 Ack=0 Win=5840 Len=0
Try to turn off ECN:
echo 0 > /proc/sys/net/ipv4/tcp_ecn
best regards
Andreas Janssen
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Andreas Janssen <[EMAIL PROTECTED]>
PGP-Key-ID: 0xDC801674
Registered Linux User #267976
http://www.andreas-janssen.de/debian-tipps.html
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