Mailing List Archive: Trac: Users

Webpage not available error when using VPN

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pankaj013 at gmail

May 15, 2008, 5:00 AM

Post #1 of 5 (137 views)
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Webpage not available error when using VPN

Hi

I have setup Trac on a Windows XP server. Problem is when I or anybody
tries to access it
from outside office using VPN, we get frequent Webpage not available
errors. A refresh in
the browser makes it work sometimes but login definitely never works
and always leads to
webpage not available. This was when I was using tracd. I moved to
Apache 2.2 and now the p
roblems have reduced and I can login but I still get WebPage not
available error sometimes.

Is there an specific problems using Trac over VPN.

Thanks
Pankaj

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jpwasp at rit

May 15, 2008, 8:21 AM

Post #2 of 5 (127 views)
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Re: Webpage not available error when using VPN [In reply to]

-----Original Message-----
From: Pankaj Chawla

Is there an specific problems using Trac over VPN.
-------------------------

There shouldn't be. Something like a VPN should be transparent to a
server, because what VPN does is effectively simulates the remote
machine as a machine on the local network. The only real different is
performance. If the pages are too big and/or loading too slowly maybe it
can trigger that error.

Otherwise, it could be a fault in the VPN with the connection dropping
occasionally.

Jason

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pankaj013 at gmail

May 15, 2008, 9:17 AM

Post #3 of 5 (126 views)
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Re: Webpage not available error when using VPN [In reply to]

On May 15, 8:21 pm, "Jason Winnebeck" <jpw...@rit.edu> wrote:
> -----Original Message-----
> From: Pankaj Chawla
>
> Is there an specific problems using Trac over VPN.
> -------------------------
>
> There shouldn't be. Something like a VPN should be transparent to a
> server, because what VPN does is effectively simulates the remote
> machine as a machine on the local network. The only real different is
> performance. If the pages are too big and/or loading too slowly maybe it
> can trigger that error.
>
> Otherwise, it could be a fault in the VPN with the connection dropping
> occasionally.

Hi Jason,

I have been using VPN for years for accessing both intranet and
internet sites
and I never have this problem. Also if you note, the problem got a lot
better when
I moved from tracd to apache (with tracd I can never login) but with
apache also
I get the problem even though a lot less. So looks like the bottleneck
is somewhere
in trac-python integration which is not able to synthesize the pages
quick enough for
the server to pass on to the client. I am using python25 with trac
0.11b

Thanks
Pankaj
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manu.blot at gmail

May 15, 2008, 9:20 AM

Post #4 of 5 (126 views)
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Re: Webpage not available error when using VPN [In reply to]

> I have been using VPN for years for accessing both intranet and
> internet sites
> and I never have this problem.

Are you sure that the Trac configuration (especially base_url if used)
matches the configuration of the virtual lan ?

HTH,
Manu

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dy20lqh02 at sneakemail

May 15, 2008, 10:19 AM

Post #5 of 5 (126 views)
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Re: Webpage not available error when using VPN [In reply to]

Pankaj Chawla pankaj013-at-gmail.com |TracMailingList| wrote:
> Hi
>
> I have setup Trac on a Windows XP server. Problem is when I or anybody
> tries to access it from outside office using VPN, we get frequent
> Webpage not available errors. A refresh in the browser makes it work
> sometimes but login definitely never works and always leads to
> webpage not available. This was when I was using tracd. I moved to
> Apache 2.2 and now the problems have reduced and I can login but I
> still get WebPage not available error sometimes.
>
> Is there an specific problems using Trac over VPN.

We had a similar problem running Trac (tracd) on Windows Server 2003, where we could get small pages, but larger pages sometimes failed, and when we increased the size of the logo on the trac wiki, our VPN clients never received the logo.

In our case the solution was to increase the TunnelMTU setting. You do this on the client computer, not the server. In the registry, go to HKLM/SYSTEM/CurrentControlSet/Ndiswan/Parameters/Protocols/0
If this key doesn't exist, create it. Then modify or add DWORD entries:
ProtocolType 800 hex
PPPProtocolType 21 hex
TunnelMTU 1250 decimal

See microsoft kb article 826159 (http://support.microsoft.com/kb/826159) for details. Also google "VPN Tunnel MTU" for additional info (and yet more evidence on how Microsoft breaks everything). :)

For what it's worth, this also resolved some problems we had with TortoiseSVN connecting to our Subversion server (running on the same Windows 2003 server as the tracd server), where large checkouts would hang.

Hope this helps.

Don

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