1. Check the IP is correct or not, use our ip search tool to find it.
2. Check the port is correct or not, our default port is 80, if the manager changed it, it may not be the default value. (default typing 192.168.0.120:80)
3. Check the "http" protocol has been changed to https, then you need to type https://192.168.0.120, but not http://192.168.0.120
4. Make sure the password is correct. The default account infor. is admin/admin
5. Make sure the network port hardware is working fine. it will flicker all the time.