no access to some websites

[easynet]

Hi,

My config :

- adsl modem-router d-link G604t

- one server Windows 2003 and 2 clients on the domain (XP SP2)

- another pc out of the domain

All was working correctly until yesterday: internet-mail-remote access (TS)
etc...

I had to restore default configuration of the router because of loosing my
password...

After restoring and rebooting the router, a problem has appeared:

Some websites are no more accessible and other well.
If I try with www.infobel.be, a redirection occurs to
http://www.infobel.com/belgium/ and then: "the white page" with no error
message.
In the status bar "Wainting for ..." and nothing else
www.microsoft.be redirect to http://www.microsoft.com/belux/ and than
...nothing
www.dell.be opens correctly after redirection.

www.google.be woks correctly etc...

About 50% of the websites are unreachable.

I did uninstall SP2 on one of the pcs, disabled the firewall, without
success.

The same problem is observed on the server and the 2 pc of the domain. A
third pc is connected to the router but don't belongs to the domain and all
works correctly for him.



Some help would be very useful.

I'm not a specialist but accessing the internet is very important for my
work.

Thanks a lot



Jean-Paul

 

[Robert L [MS-MVP]]

sounds like MUT issue. 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


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