[ka-Map-users] IE broken images

[Ed McNierney]

Jacob -

Yes, I think the "automated mindless policy" theory's a good one.

I realized after I sent my note that an XP server could be a problem -
your explanation makes more sense now.  I just always try to remain a
*little* skepticism when I think I've found a problem!

	- Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
Phone: +1 (978) 251-4242
Fax: +1 (978) 251-1396
ed at topozone.com

-----Original Message-----
From: ka-map-users-bounces at lists.maptools.org
[mailto:ka-map-users-bounces at lists.maptools.org] On Behalf Of Delfos,
Jacob
Sent: Thursday, January 05, 2006 10:03 PM
To: ka-map-users at lists.maptools.org
Subject: RE: [ka-Map-users] IE broken images

Ed,

Our IT guys suspect it may be a policy rolled down from our US office,
implemented by someone not considering negative impacts. The reason it
crashes my server is that it requests too many tiles at once. Especially
before the changes in ka-map that prevent loading of invisible layers,
it would try to get 160 tiles at once (mostly high-res full-colour). If
those requests were sent simultaneously, rather than sequentially, then
IE itself can get messed up, but the server as well. I'm not using your
kind of hardware :) Our internal server is a pc (3.2GHz, 1GB), running
XP (not Windows Server). I'm quite sure that that is the reason why the
internet standard is 2. I think firefox uses 24 by default.

Regards,

Jacob

 

> -----Original Message-----
> From: Ed McNierney [mailto:ed at topozone.com]
> Sent: 6 January 2006 10:50
> To: Delfos, Jacob; ka-map-users at lists.maptools.org
> Subject: RE: [ka-Map-users] IE broken images
> 
> Jacob -
> 
> Some quick Googling shows that other users have reported this 
> 10,000-setting symptom, but without explanation.  Some of the posts 
> are several years old.  It's possible that some third-party Internet 
> "optimization" or "security" software tweaks it when installed.
> 
> But why should that setting crash your server?  That setting ALLOWS 
> your client to create up to 10,000 connections, but doesn't REQUIRE it

> to.
> Your client is presumably capable of generating a few dozen 
> simultaneous requests in a typical kaMap situation.  If your server 
> can't handle that, then perhaps something else is the problem, too.
> 
> 	- Ed
> 
> Ed McNierney
> President and Chief Mapmaker
> TopoZone.com / Maps a la carte, Inc.
> 73 Princeton Street, Suite 305
> North Chelmsford, MA  01863
> Phone: +1 (978) 251-4242
> Fax: +1 (978) 251-1396
> ed at topozone.com
> 
> -----Original Message-----
> From: ka-map-users-bounces at lists.maptools.org
> [mailto:ka-map-users-bounces at lists.maptools.org] On Behalf Of Delfos, 
> Jacob
> Sent: Thursday, January 05, 2006 9:22 PM
> To: ka-map-users at lists.maptools.org
> Subject: [ka-Map-users] IE broken images
> 
> I spoke a bit fast just now the broken images... After researching the

> IE broken image problem for a _very_ long time, it just hit me what 
> could cause it.
> 
> Supposedly, the default value of the maximum number of connections to 
> one server in IE is set to 2. This is to comply with internet 
> standards (to help reduce loads on servers) That's what Microsoft 
> claims. They say you can increase it to ten, to allow you to download 
> more than 2 files from 1 server 
> (http://support.microsoft.com/?kbid=282402). For some reason, my 
> computer has a value of 10,000. So did my colleagues. So it's no 
> wonder that IE caused my server to crash. The fix is documented in the

> link I sent, but for simplicity sake:
> 
> In:
> HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet
> Settings
> Change value of MaxConnectionsPer1_0Server and MaxConnectionsPerServer

> to something more decent (I use 5).
> 
> It fixes the problem straight away. Unfortunately, you can't really 
> tell all your visitors to hack their registry....
> 
> Why would our pc's have a default value of 10,000? That's ridiculously

> high.....
> I'll check with Microsoft on this....
> 
> Regards,
> 
> Jacob
> 
>  
> 
> _______________________________________________
> ka-Map-users mailing list
> ka-Map-users at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/ka-map-users
> 

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