TCP Window Scaling
Printed From: LogSat Software
Category: Spam Filter ISP
Forum Name: Spam Filter ISP Support
Forum Description: General support for Spam Filter ISP
URL: https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=6069
Printed Date: 14 March 2025 at 7:28pm
Topic: TCP Window Scaling
Posted By: mikek
Subject: TCP Window Scaling
Date Posted: 16 May 2007 at 5:30am
Hi Roberto
I'm having problems with one ISPs mailserver. As soon as he tries to send our spamfilter a large mail (> 4 MB), the connection stalls and disconnects after a certain timeout.
The ISP tried disabling TCP window scaling on his end and then the mail went through.
Since Windows Server 2003 supports window scaling out of the box and our firewall (Cisco PIX 7.1) does as well, I'm now asking you if Spamfilter supports it as well after I read this (from: http://www.microsoft.com/technet/technetmag/issues/2007/01/C ableGuy/default.aspx?loc=en)
Finally, the maximum receive window size can be specified by an
application by using the SO_RCVBUF Windows Sockets option when a
connection is initiated. For window scaling, the application must
specify a window size larger than 65,535 bytes.
I know it's a long-shot, but I thought I'd ask before digging into network traces...
Cheers,
Mike
|
Replies:
Posted By: LogSat
Date Posted: 16 May 2007 at 7:20am
Sorry Mike, SpamFilter is not configured to allow modifications to the Windows Socket options for connections. We will use the current settings in the OS (which can be modified via the registry entries in the article you found).
-------------
Roberto Franceschetti
http://www.logsat.com" rel="nofollow - LogSat Software
http://www.logsat.com/sfi-spam-filter.asp" rel="nofollow - Spam Filter ISP
|
|