Make sure no other devices connected to the router wired or wirelessly, only connect your PC to the router by a cable. If you just change the LAN IP address, it should be ok, also make sure the...

Looks like your printer is not on the router's Print Server Compatibility List, maybe that's a compatibility issue....

Hi, did you try reset it to factory settings by holding the reset button for 10s? If not working, try update the firmware.

Hi, what's the level of the three Attack Filtering? Change them to Low or Off to have a try.

Hi, is the issue solved?

Hi, what's the model of the camera?