it could be MTU issue. quoted from
http://www.howtonetworking.com/troubleshootingie.htm
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
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.
Bob Lin, MS-MVP, MCSE & CNE
How to Setup Windows, Network, Remote Access on
http://www.HowToNetworking.com
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
This posting is provided "AS IS" with no warranties.
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I have a network with 3 computers all running Win XP Home and connected by a
wireless (Linksys wireless-B) network to broadband and Xbox live hooked in.
The problem is that all 3 computers have limited access to the web. Page
loading can be very slow at times irregardless of whether or not we are all
connected. Pages like Hotmail.com and Ebay.com will not load, but other
secure connections will load. I have tried messing with internet options
(security and others) and I'm completely stumped.
