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ClaudeA

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Since: Mar 18, 2005
Posts: 3



(Msg. 1) Posted: Fri Mar 18, 2005 10:11 am
Post subject: slow page downloads
Archived from groups: microsoft>public>inetserver>iis (more info?)
Client machines running XP SP2 with firewall enabled experience slowness
(each page load takes about four times longer).

Pages are served from mainframe sitting behind a CISCO 11506 content switch.
Images have been offloaded to two Windows 2003 servers running IIS 6.0.

We disabled the firewall on the XP client machines and it works as normal.

Our customers want the firewall enabled to protect their machines from
threats on their internal networks. So they do not want to disable the XP
firewall if at all possible.

We allowed the images requests to go to the mainframe and it works with the
XP firewall enabled. This defeats the purpose of having the content switch
and the Windows servers.

With the XP firewall enabled and images served from IIS (even with internet
explorer added to the the firewall exceptions list), the pages load slowly.

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user1772

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Since: Jun 10, 2004
Posts: 1807



(Msg. 2) Posted: Fri Mar 18, 2005 3:35 pm
Post subject: Re: slow page downloads [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On Fri, 18 Mar 2005 10:11:02 -0800, "ClaudeA"
<ClaudeA RemoveThis @discussions.microsoft.com> wrote:

 >Client machines running XP SP2 with firewall enabled experience slowness
 >(each page load takes about four times longer).
 >
 >Pages are served from mainframe sitting behind a CISCO 11506 content switch.
 > Images have been offloaded to two Windows 2003 servers running IIS 6.0.
 >
 >We disabled the firewall on the XP client machines and it works as normal.
 >
 >Our customers want the firewall enabled to protect their machines from
 >threats on their internal networks. So they do not want to disable the XP
 >firewall if at all possible.
 >
 >We allowed the images requests to go to the mainframe and it works with the
 >XP firewall enabled. This defeats the purpose of having the content switch
 >and the Windows servers.
 >
 >With the XP firewall enabled and images served from IIS (even with internet
 >explorer added to the the firewall exceptions list), the pages load slowly.

So you're saying that IIS works fine, but you have a conflict between
your Cisco content switch and the XP2 SP2 firewall? What did Cisco
say when you asked? What did the folks in the XP newsgroups say?
What function in IIS do you believe could possibly fix your issue?

Jeff<!-- ~MESSAGE_AFTER~ -->

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ClaudeA

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Since: Mar 18, 2005
Posts: 3



(Msg. 3) Posted: Fri Mar 18, 2005 3:35 pm
Post subject: Re: slow page downloads [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
The problem seems to be Windows Server 2003 talking to XP2 SP2 firewall.

All the traffic is routed through the content switch and if we route the
image requests back to the mainframe there is no slow down. The mainframe
web server and tcpip layer talking to XP2 SP2 firewall experiences no problem
through the content switch.

Without the XP2 SP2 firewall there is no problem when the image requests are
routed to the Windows Server 2003 or the mainframe.

The XP2 SP2 firewall log shows an increased number of dropped TCP/IP packets
with ARP tcpip flags set when requesting images from the Windows 2003 server.
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ClaudeA

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Since: Mar 18, 2005
Posts: 3



(Msg. 4) Posted: Fri Mar 18, 2005 5:55 pm
Post subject: Re: slow page downloads [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
I'm sorry, I'll try to unmuddle some of my message and answer your questions.

 > So you're saying that IIS works fine, but you have a conflict between your Cisco content switch and the XP2 SP2 firewall?

We concluded that the conflict was between the Windows 2003 IIS box and the
XP2 SP2 firewalled box, because:

First a expository lump: All requests go to the content switch. The content
switch handles the requests and spoofs the origin server(application server)
and requests the pages from the application server and the images from image
servers. It establishes a pipe (flow) between the servers and the client.
All the content then flows from the servers through the content switch.

Case 1: slow result
images flows from IIS
page flows from mainframe
xp sp2 firewall enabled


Case 2: normal response
image flows from mainframe
page flows from mainframe
xp sp2 firewall enabled

Case 3: normal response
images flows from IIS
page flows from mainframe
xp sp2 firewall disabled

 >What did Cisco say when you asked?
When we presented the above information to Cisco they came to the same
conclusion that we did: The content switch is always present, all flows pass
through it. The only case when the slowness occurs is when both the XP2
firewall are enabled and Windows 2003 IIS is providing images.

 >What did the folks in the XP newsgroups say?
No response yet. There seems to be some issues with ip security and
slowness from another source.


 > What function in IIS do you believe could possibly fix your issue?
I don't think a function in IIS will fix the issue. I think people with
more experience with IIS may have better insights into the things that go
wrong and can provide me with things to look at.

Claude<!-- ~MESSAGE_AFTER~ -->
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