Ok, this problem has been plaguing me for about 2 weeks now.

In my company we are having a little problem where all the PC's have perfectly good connection to the LAN and all the servers but we have instances where people cannot access the internet.

It does not happen to everyone at the same time. For instance I may have internet access while one of my partners has none. Most of the time to fix this I just click diagnose and repair on my machine and write www.google.com and keep refreshing until it works.

Another note of something I did notice this week was that I was connected to messenger and I could send and recieve messsages but I could not access any page on the internet.

Anyone got any ideas on what could be happening?

By the way to give out a little more info. Switches seem to be working ok. Our firewall is administered by a remote company and we called and it all seems to be ok.

Can you poing anything on the WAN???

What type of internet connection do you have...DSL, T1, Cable..???

What is the router???...how is it configured???

Need info...

When I have no access to the internet I haven ot tried pinging anything but I will today with the command prompt to see if I can see anything.

I am using a T1 connection.

The router and firewall are in house but it is administered remotely for us.

Everything was working fine up until 2 weeks ago and we have changed nothing from the configuration.

Normally when your ISP provides the connection and remotely administers the connection...you call them and they work on it...maybe your router is bad...maybe your T1 went down...

They should be able to tell you if your connection to them is good...

You mention firewall so I assume it is a hardware firewall...can it be taken out of the system, and can one computer (laptop) be connected directly to the router to see if you have Inet connectivity???

Ok I already verified with my ISP and the T1 is working fine. I also called the company that administers our router/firewall and they say everything is fine also.

This morning when I arrived I noticed I had no internet so I tried pinging a site from the command prompt and it didn't even try to ping. After repairing the wireless connection like 3 times I finally got to open a page but when I try to ping from the command prompt the request times out even when I do have internet and can open websites.

Could it be a switch problem or a DNS server problem?

Ok...T1 to Router to Switch to Computers...
Yes, it could be a switch...Do you have another switch you can substitute in???

Becasue some computers get in the inet and others do not at the same time...it could be that some ports on the switch are shutting down...

Replaced switch with a new one and I am still having problems with it.

Look at your tcp/ip settings.
What address(s) is the DNS entry pointing to. Do you have a MS server running DNS and is this workstation dns entry that of that internal ms server?
What is suppling dhcp? Server or router?

Imagine the power if you knew how to internet search