Slow Web Browsing/Timeouts

[Ben]

Hi,

We've got a really annoying problem, that I can't seem to find the source
of. In the past week, internet browsing has become really slow, with some
pages taking 2 or 3 minutes to load, or even timing out, but then load when
you refresh. However this is only for some people, and only intermittently.
It could just be 2 or 3 people at any one time, and last for an hour, then
be fine, but then someone else will have a problem. I've run perfmon, and
network utilisation is at about 1%, so there is barely any traffic, I
thought maybe it was DNS, so I made sure the DNS entries on our DNS server
were all correct then flushed and re-registered everyone's DNS. There are no
errors in any of the event logs. I've run ADSL speed tests, and all come
back pretty much as expected, we're well with in our speed limit.
We're running Windows 2003 (SP1) domain, and Windows XP (SP2) clients. We're
running through an ISA 2004 firewall, users are configured as SecureNAT
clients.
Nothing has changed in the past week, besides the Microsoft WMF hotfix being
installed on the server, but this shouldn't cause any internet related
problems, should it?

Any help, or advice would be greatly received.

Ben

 

[Phillip Windell]

A few possibles:

1. Spyware/Adware/Virus on the local machines
2. Local browser cache (Temp Internet Files) set to high. I always run
the
minimum (1meg) and pick "Every visit to the page"
3. Web Cache on the proxy too large. Set it to only a few hundred meg.
4. Proxy using a SQL Server for its logs and the SQL Server is slowing
down.
Since logging requires everything be logged. Each page loaded can
cause over
a 100 log entries. The page can only load as fast as the SQL Server
can except
the DB updates to the log records.
5. DNS scheme for the LAN is not correct. All machines (every last one
of them)
should use *only* the internal AD/DNS. The AD/DNS then uses the
ISP's
DNS as a Forwarder. The AD/DNS is the only machine that makes
direct
outbound DNS queries.


--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp

Deployment Guidelines for ISA Server 2004 Enterprise Edition
http://www.microsoft.com/technet/prodtechnol/isa/2004/deploy/dgisaserver.mspx

 

[Guest]

When i am receiving e-mails on my site the times are out of wack by 3 to 4
ours ahead can anyone tell me why this is happening?