Jim: if the DHCP in the thing is turned on, that may be the cause of the grief. Next time you're tweaking it, take a look and turn it off.
Assuming your network is 192.168.0 and the thing is on factory settings, user access will be to 192.168.0.254. The username and password are both "admin".
For my friend in the village, the simple test (ie the way we found where the problem was) lies in the IP address the iPad etc has. I joined the network in the study, where the main router is, and got an address of 192.168.0.4. I then wandered through the kitchen where the TPLink is, and into the dining room. The address stayed the same. The signal strength indication was "all bars", and I could still access the internet. There had previously been one or no bars in the dining room.
She connected her iPad in the dining room, and got an address of 192.168.0.100 with all bars, and could not access the internet. I then fished out my iPhone and connected it, to receive 192.168.0.101 etc.
Now that its DHCP is off, IP addresses start with 192.168.0.4 (the desktop is always on, hard wired, and is .0.3).
Last edited by Keef; 14th October 2013 at 23:26.