2033E The authentication host or the network is unavailable

I have a Truemobile 1184 Router, an Inspiron 5150 with Truemobile 1300 Card and a Compaq Desktop.

The compaq desktop is hardwired to the Router and the Inspiron 5150 is connected to the Router wirelessly.

Sometimes I am able to connect to the Internet from both the machines, but at other times I get this error message 2033E The authentication host or the network is unavailable, both from my desktop and from my laptop, I am able to access the desktop from my laptop, and also the otherway way round, but connecting to the Internet is where I get stuck.

Another Interesting thing that I noticed is that when I am connected to the Internet from both machines, and when I open up the Web configuration utility for the Truemobile 1184 Router and check the Device Status, there is a red cross in between the Router and the Internet. This really baffles me as the it also says that the cable/xDSl status is not active, eventhough I am connected to the Internet.

I have a SB4200 Motorola Modem which is connected to the Internet always and my ISP is Telstra Bigpond, I have tried contacting the Dell and Bigpond but no solution has come as yet.

Please help....

with regards

the_apostate