[SAC] errors with Trac
Paul Spencer
pspencer at dmsolutions.ca
Fri Oct 2 08:41:17 EDT 2009
On 2009-10-02, at 3:20 AM, Christopher Schmidt wrote:
> On Thu, Oct 01, 2009 at 05:33:10PM -0400, Paul Spencer wrote:
>> We replaced our router with a fancy new dual-wan VPN router and it
>> was
>> configured to load balance outgoing traffic between a DSL and a cable
>> connection (each having a different external IP address, one static
>> and
>> one dynamic). I thought this happened some time before we started
>> experiencing this problem and had forgotten about it.
>>
>> The solution appears to be to direct all outgoing traffic to the
>> osgeo
>> servers trac, www and svn to use only one of the connections. It is
>> still unclear what is different between OSGeo's setup and the setup
>> on
>> openlayers.org and our own trac/svn but I suspect that somehow the
>> authentication is being done with some affinity to the user's IP
>> address,
>> which in our case was changing essentially randomly between
>> subsequent
>> requests. I have not confirmed this
>
> I'm surprised that your own trac and the OL trac weren't equally
> affected; in
> my experience, I've always had trac get cranky when I switch
> connections, but
> since I only do it a coule times a day, that's obviously not
> particularly
> scientific.
>
> Trac version may also play a role; if your trac is newer, the behavior
> may have changed.
>
we just upgraded to 0.11.5 a couple of days ago, but before that we
were on the same version as OSGeo so I think trac version is not a
factor.
I am convinced the problem is with our router, I think it should be
maintaining some sort of session affinity for users connecting to
specific IPs within a given timeframe by routing them out the same WAN
connection. For whatever reason, I think this is working for some
destinations but not for others.
In any case, I apologize for the extra noise this created but
hopefully if someone else starts reporting a similar issue this may be
the cause/resolution for them as well :)
Cheers
Paul
__________________________________________
Paul Spencer
Chief Technology Officer
DM Solutions Group Inc
http://research.dmsolutions.ca/
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