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Re: Connection closed when going through content switch

From: <david.x.grierson_at_jpmorgan.com>
Date: Tue, 26 Aug 2008 16:28:26 +0100

Check that the f5 content switch supports webdav.

Cisco content engines don't - it could be a similar problem to that.

See this thread for details:




David Grierson
JPMorgan - IB Architecture - Source Code Management Consultant
GDP 228-5574 / DDI +44 141 228 5574 / Email david.x.grierson_at_jpmorgan.com
Alhambra House 6th floor, 45 Waterloo Street, Glasgow G2 6HS
JJ <eggsgloriouseggs_at_gmail.com> 
26/08/2008 16:19
Connection closed when going through content switch
I have a Solaris 10 server running Subversion 1.5.1 served by Apache 2.2.9 
sitting behind an f5 content switch.  The content switch redirects all 
traffic to the one Subversion server.  In case of emergencies we can 
manually redirect the content switch to a secondary server that is synced 
to with svnsync.  In general though, the traffic is all directed to one 
This setup works fine in most cases.  We have run into one odd problem 
On Windows, if I checkout a working copy and try to store it on NAS via a 
mapped drive, part way through the checkout I get the following error and 
the checkout aborts.
svn: REPORT request failed on '/svn/REPONAME/!svn/vcc/default'
svn: REPORT of '/svn/REPONAME/!svn/vcc/default': Could not read response 
body: An existing connection was forcibly closed by the remote host.   (
The error does not occur when the working copy is stored locally, or when 
the working copy is stored on NAS but I connect directly to the server 
instead of the content switch.
A member of the network team here did a trace during checkout numerous 
times and determined the following.
We noted in the traces that the client TCP Receive Window drops to 0, 
indicating he can't receive any more data.  He sends a zero window probe 
about 8 times over about 45 seconds, after which time the server resets 
the connection.
I cannot tell why the client TCP window goes to 0 when the traffic is 
through the content switch, but not when it goes directly to the server. I 
think a ticket should be opened with the vendor for the client program to 
see if they've encountered this before.
Does anyone have any idea why this is happening?  Should I change some 
setting with Apache so the connection isn't closed?  I realize NAS here is 
slow, but we have a need for it.  I just want to ensure that the checkout 
isn't killed by the server.
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Received on 2008-08-26 17:29:38 CEST

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