TP-Link TL-WR810N User Manual page 286

5. The wireless stations cannot connect to the Router.
1) Make sure the "Enable Wireless Router Radio" is checked.
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.
If the wireless connection is ready, but you can't access the Router, check the IP Address
4)
of your wireless stations.
TL-WR810N
Figure A-9 Add or Modify a Virtual server Entry
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300Mbps Wireless N Mini Router