RE: ISA web proxy slowdown

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Hi Allan,

Thank you for posting in SBS newsgroup.

From the description, I understand the issue to be: Internet access is
quite slow when IE is configured to use the ISA web proxy server. However,
all works normally when you use firewall client. If I have misunderstood
your concerns, please do not hesitate to let me know.

As I know, the problem should be caused by DNS resolution. We can check the
following:

1. Check network configuration on SBS and client computer:

On SBS server:

External NIC:
IP: assigned by your ISP or your hardware router
Gateway: your ISP or your Hardware router IP
DNS: SBS INTERNAL NIC IP as the only entry

Internal NIC:
IP: Fixed IP
Gateway: None
DNS: SBS INTERNAL NIC IP as the only entry

In the DNS console (dnsmgmt.msc), right click your ServerName and click
properties. In the Forwarders tab, your ISP DNS server IP should be
inputted there.

On workstation inside your SBS local subnet

IP: Assigned by DHCP on SBS
Gateway: SBS internal NIC IP
DNS: SBS INTERNAL NIC IP as the only entry

2. Clean up the IE cache of the workstation and SBS. Clean up the IE cache:

Open Internet Explorer. Click 'Tools'->'Internet Options'. In 'General'
tab, click 'Delete files' and 'Delete cookies' buttons. Will the issue be
resolved?

3. Clean up the DNS cache of the workstation and SBS. Open a command
prompt, input 'ipconfig /flushdns'. Reboot the workstation and then try the
internet access again.
4. Check the following KB article:

839510 You experience slow Web browsing performance on internal client
computers that use Internet Security and Acceleration Server to manage Web
requests
http://support.microsoft.com/default.aspx?scid=kb;EN-US;839510

More information:

837572 Performance tuning options for Internet Security and Acceleration
Server 2004
http://support.microsoft.com/default.aspx?scid=kb;EN-US;837572

816320 How to configure firewall and Web proxy client Autodiscovery in
Windows Server 2003
http://support.microsoft.com/default.aspx?scid=kb;EN-US;816320

I appreciate your time and look forward to hearing from you.

Best regards,

Crina Li (MSFT)

Microsoft CSS Online Newsgroup Support

Get Secure! - www.microsoft.com/security

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--------------------
| Reply-To: "Al Williams" <donotreplydirect@xxxxxxxxxxxxxxxx>
| From: "Al Williams" <donotreplydirect@xxxxxxxxxxxxxxxx>
| Subject: ISA web proxy slowdown
| Date: Thu, 2 Mar 2006 10:53:08 -0700
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|
| SBS2003 Premium SP1 c/w ISA2004.
|
| I've been noticing lately that internet access is quite slow when IE is
| configured to use the ISA web proxy server.
|
| If I turn off the web proxy and use winsock via the ISA firewall client
(ie:
| "in connections, "Use a proxy server for your LAN" is disabled) all works
OK
| and the speed is returned.
|
| Anyone have any pointers as to where to start diagnosing this issue?
|
| I have the ISA caching enabled but have yet to put on ISA SP2 as I heard
| there were other issues with it.
|
| --
| Allan Williams
|
|
|
|
|

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