WindowsXP Networking + Firewall

[Andy]

Hi there,
My problems appear to have started following upgrading XP
with the SASSER worm fix from microsoft.
Basically, I have been sharing my ADSL internet
connection - my PC (server) is on WindowsXP Pro and my
kids PC is on Windows98 SE.
However now I am having trouble with sites such as Ebay,
only loading the banner and no data and my kids can't
access the internet at all.
Interestingly enough I am also using a firewall - Zone
Alarm Pro - the Internet and Trusted zones are both
currently set to Medium and have been for Months.

The network between the two PCs is working fine in terms
of being able to see into the shared elements of both
machines and pass data across the network, the only thing
that has stopped working is the internet.

Any advice would be much appreciated.

Tks,

Andy

 

[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.