192.168.l.l is the address on the local network where your router is located, such as D-link, Tp Link, Asus, Huawei, NetGear, etc.

Users usually go there e.g. to change password. Keep in mind that you need the password of the admin user to access it.

The problem is that inexperienced users often make a mistake and instead of they type in 192.168.l.l or 192.168.l.1, check if the address is spelled correctly and it should contain only digits and dots. Without any L's.

192.168.l.l 192.168.l.1

If that does not help, then add http:// or https:// in front of 192.168.l.l.