Disclaimer......connectivity problems can be difficult and complex to correct. There is no guarantee that I will be able to assist you in repairing this problem. There are no guarantees here on the forums in away, by the way. Happy

Down load the updates. The fix for your problem might be within them. Drivers are often down loaded with the updates for your Ethernet adapter chip or card. A large percentage of these are security up dates, to keep your computer safe. You should up date your PC(s).

Then double check your Email settings. Seek information from your IP if you are uncertain about them.

Check to see if your telephone line connection are correct. Unplug them then plug them in again. (If your have a spare filter for a DSL connection then switch them. The current one for the spare.)

Disconnect all the connection from your router/modem then reconnect them after one minutes. This will reset the hardware. This includes transformers. Restart your computer.

Discontent the LAN try each PC/Laptop on the connection. Did either of them work?

Did your Ethernet adapter come with diagnostics? Run them.

Reinstall JAVA.

http://www.java.com/en/download/index.jsp

Do this trouble shooter for Internet Explorer 7:

http://support.microsoft.com/gp/pc_ie_intro