Access restrictions
My router has been configured to allow only three devices to login to its management console (Web UI): my PC, laptop, and mobile phone. The router uses the devices' IP addresses as the access filter (essentially, a "white list" of permitted devices/IPs).
This means those devices' IPs must not change when they join the network (the router's DHCP server may do that automatically). If a device's IP changes, that device will not be allowed to login to the management console because its new IP will be different from the one stored in the access list. Therefore, I configured the router to make those device IP addresses static IPs, which means the three devices will always have the same whitelisted IPs when they join the network.
Firewall settings
IPv4 firewall: Enabled
