Cannot connect to certain sites

I can't connect to certain sites at my work (I have a wireless connection
over there).
For example I can't connect to any microsoft site, www.zita.be and other. On
the other hand I can connect to www.google.com, and most other sites. Now I
am at home (connected via cable) and I can visit every website.
Also the connection with outlook to my work mailserver (for incoming mail)
is very unreliable (sometimes normal at other times at 34B/s, no typo).
Anyone an idea on how this can be solved?

We have seen similar case. Try to install the latest firmware first. Or this
link may help.

Vista Internet Access IssuesVista: Can't access some secure web sites ...
don’t fix the problem, try to use FireFox because some web sites and coding
may not be compatible with IE 7. ...
www.chicagotech.net/vista/vistaieissues.htm


--
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com


"Reagens" <Reagens@discussions.microsoft.com> wrote in message
news:1B13728A-6A43-4013-BDBA-AE1949C1A0A2@microsoft.com...
>I can't connect to certain sites at my work (I have a wireless connection
> over there).
> For example I can't connect to any microsoft site, www.zita.be and other.
> On
> the other hand I can connect to www.google.com, and most other sites. Now
> I
> am at home (connected via cable) and I can visit every website.
> Also the connection with outlook to my work mailserver (for incoming mail)
> is very unreliable (sometimes normal at other times at 34B/s, no typo).
> Anyone an idea on how this can be solved?