Troubleshooting Web Management Access Failure After Changing Router Interface IP

After enabling the WEB function, the device’s web management page could be opened at 192.168.1.1. When the interface IP was changed to 192.168.2.1, the PC could no longer open the AR web page and displayed a "web page open error". Changing the PC’s IP to 192.168.2.2 allowed it to ping 192.168.2.1, but the web login still failed.

Troubleshooting steps

1. Verify that after changing the interface IP, the PC’s address is in the same subnet as the router’s interface and that connectivity is normal; ping to 192.168.2.1 succeeded.

2. Check whether the AR router has any login restrictions.

3. Verify that the HTTP server is running correctly.

<LNS>display http server
HTTP server status    : enable (default: disable)
HTTP server port      : 80 (default: 80)
HTTP timeout interval : 3 (default: 3 minutes)
Current online users : 0
Maximum users allowed: 5
HTTPS server status   : enable (default: disable)
HTTPS server port     : 443 (default: 443)
HTTPS SSL Policy       :

4. Display TCP status to confirm listening ports.

<LNS>disp tcp status
TCPCB    Tid/Soid Local Add:port        Foreign Add:port      VPNID  State
38ed4ffc 7  /1    0.0.0.0:23            0.0.0.0:0            23553  Listening
38ed4cf4 79 /1    0.0.0.0:80            0.0.0.0:0            23553  Listening
38ed5488 79 /2    0.0.0.0:443           0.0.0.0:0            23553  Listening

The information shows that the HTTP server is operating normally; a telnet test to 192.168.2.1 on port 80 succeeds, confirming that the router’s HTTP function works. Since the only change was the interface IP address, the next step is to examine the browser’s settings.

5. Add 192.168.2.1 to the browser’s "Trusted Sites" list; after doing so, the device’s web page opens successfully.

Root cause

The PC’s browser had previous security settings that treated the new management address as an untrusted site, preventing the web management page from loading.

Solution

Add the AR management address to the browser’s trusted sites, or lower the browser’s security level, to regain access to the web management interface.