TP-Link TL-MR3420 User Manual page 112

4. I want to build a WEB Server on the LAN, what should I do?
1) Because the WEB Server port 80 will interfere with the WEB management port 80 on the
Router, you must change the WEB management port number to avoid interference.
2) To change the WEB management port number: Log in to the Router, click the "Security"
menu on the left of your browser, and click "Remote Management" submenu. On the
"Remote Management" page, type a port number except 80, such as 88, into the "Web
Management Port" field. Click Save and reboot the Router.
Note:
If the above configuration takes effect, to configure to the Router by typing
http://192.168.1.1:88 (the Router's LAN IP address: Web Management Port) in the address
field of the Web browser.
TL-MR3420
Figure A-7 Basic Security
Figure A-8 Remote Management
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3G/3.75G Wireless N Router