Connection Problem

Sorry to be a newbie pain in the asse, but im having severe problems with my connection.

I have a three pc lan set up going through an ethernet router, with a 2mb internet connection i can run happily to the net for what i timed as a three hour connection for now, but as soon as an application sharing utility is run, or a connection to a file sharing network is established i have the internet cut off, i have check the router - and i found it was fine, i can speak to the other pc's fine, but the modem loses its connection tot eh outside world...

Is there any thoughts on what could be causing this?

I have worked this out about 2 years ago and had it working fine, until i introduced the third machine to the network, i have since had to re-network it all to even get it to recognise the net at all, and the other machines.

Having redone the network i have spent all of today waiting the time to see how long i would stay connected, on avergae i get 10-15 minutes with file sharing done, sometimes 5 minutes only, even now i am having to disconnect the plug and replug it back in to effectively reset the cable modem...

If anyone can give me a hand with this i would be so happy.

Thanks Guys.

£What no one able to help from the 17 already having viewed?

It sounds like you might have a software firewall type of thing in your router. Dig out your router manual and figure out the IP address to type in IE to access your router's settings. Poke around in there and see if you have some security settings to shut off the Internet when you try to do the things you want to do.

Cheers for the reply, although i know it wont help, i have already used the ip address, standard 192.168.8.1, where you access most routers, i have implemented a DMZ, where i can pass info through allowing stable connections.

The thing that bugs me is that i can work fine apart from when i connect to another machine on the net, like Gaming, forums, everythign really cuses problems, but i had it set up perfect where it wouldn't...

So any help i would appreciate it.

Still no help here?

which operating systems are you using?