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Re: Connection closed when going through content switch

From: JJ <eggsgloriouseggs_at_gmail.com>
Date: Wed, 27 Aug 2008 12:22:13 -0500

The content switch supports webdav. It works fine in every other
circumstance. It only fails when checking out through the switch and
storing to a working copy on a windows drive mapped to NAS. The slow write
to NAS causes the client buffer to fill up, it keeps telling the server the
client buffer is full and eventually the server closes the connection. I
don't understand why that would happen through a content switch but not when
connecting directly to the host.

On Tue, Aug 26, 2008 at 10:28 AM, <david.x.grierson_at_jpmorgan.com> wrote:

> 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:
> http://svn.haxx.se/users/archive-2008-05/0022.shtml
> HTH,
> Dg.
> --
> 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
> To
> users_at_subversion.tigris.org
> cc
> Subject
> Connection closed when going through content switch
> Hi,
> 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
> server.
> This setup works fine in most cases. We have run into one odd problem
> though.
> 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. (
> http://SVNSERVER)
> 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.
> Thanks,
> JJ
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Received on 2008-08-27 19:22:40 CEST

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