Better to use different channels.

What's the IP address of the server and W8980? The server is using port 80 or any other one? W8980 is working as a modem router or just a router? To change IP address of the router should not...

It becomes abnormal after thunder strike? If reset won't help, it should be faulty then.

Try to install it on a different PC or buy a new adatper.

You can know more about WR841N using the emulator. I didn't find related settings as you expected. http://www.tplink.com/resources/simulator/TL-WR841ND_v9/Index.htm

Check status of local area connection and wireless network connection if the connection drops. Try to login its web interface. If it won't work, check Status of all lights on its front panel. When...