ICS Troubleshooting

[sAYk]

I have two laptops 1 with (Host)XP and another win (Client)ME, the client PC
connects to the internet without no problem and can also download emails,
the problem is that on the client PC pages like Hotmail Web Page, MS
Messenger (chat) and Yahoo do not load, I can browse many pages but I'm not
able to browse those specific pages, I've check the IE Security settings and
there are no option specifying to block any of those pages,

I have installed on both computers BlackICE Firewall, please note that I've
also tried to browse those pages by stopping the firewall, and the problem
still persists.

 

[Robert L [MS-MVP]]

quoted from http://www.ChicagoTech.net
Can't access some web sitesSymptoms: 1) If you're using MS ICS or Windows
server as router to access the Internet, your clients may not be able to
access certain web sites. However, the ICS host or the server doesn't have
this problem.
2) After installed a new router or cable modem replacing dial-up to access
the Internet, you can't access some web sites.
3) You also find that most web sites you can't access are block to ping or
they are security sites using HTTPS.

Causes: 1) The problem occurs because many web servers block ICMP messages
and the packets are dropped. As a result, the requested web site doesn't
load.
2) This problem is caused also by an incompatible MTU networking setting.
You may try to install the latest SP. If you use MS ICS, you may want to
configure all your Client computers to use the new, lower MTU as the default
for all Internet communication. To modify the MTU size, locate the following
registry key: HKEY_LOCAL_MACHINE\ SYSTEM\ CurrentControlSet\ Services\
Tcpip\ Parameters\ Interfaces. If you use a router like Cisco DSL Router,
you may want to adjusting the PPPoE MTU Size. For example, to adjusting the
PPPoE MTU Size on the Cisco DSL Router, do

interface ethernet0
no shut
ip address <ip address> <subnet mask>
ip adjust-mss 1452


--
For more and other information, go to http://www.ChicagoTech.net

Don't send e-mail or reply to me except you need consulting services.
Posting on MS newsgroup will benefit all readers and you may get more help.

Robert Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN, Anti-Virus, Tips & Troubleshooting on
http://www.ChicagoTech.net
This posting is provided "AS IS" with no warranties.

 

[sAYk]

Thanks for your input, got allot of reading to do, I'll follow you steps and
advise how all went after,

Thanks!

 

[sAYk]

I've just found my problem, please take note of this post since I think many
people who are having this type of problems might solve them the way I did:

I have installed on my system the "TuneUP Utilities 2004" (Which by the way
is a great Optimizer Software), on its internal tools it has one called
"Internet Optimization", it gives you the option to Accelerate downloads and
internet surfing by modifying some internal parameters (MTU Related), so
what happen was that I've had it optimized for a DialUP Connection and this
change my MTU to a lower value, to fix the problem I ran the Optimized
application again and specified "Local Network" as my type of connection
instead of the Dialup option, of course this increase the MTU to a higher
value and fix my problem.

So to make a long story short, if you have any Optimizer Software installed
and you ran and optimized on your Internet Connection, run it again and
change its parameters to a higher type of connection (e.g.: Local Network,
DSL, etc).