TP-Link TL-WR720N User Manual page 107

5. The wireless stations cannot connect to the Router.
1) Make sure the "Wireless Router Radio" is enabled.
2) Make sure that the wireless stations' SSID accord with the Router's SSID.
3) Make sure the wireless stations have right KEY for encryption when the Router is
encrypted.
4) If the wireless connection is ready, but you can't access the Router, check the IP Address
of your wireless stations.
Figure A-9 Add or Modify a Virtual server Entry
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TL-WR720N 150Mbps Wireless N Router