Network printer not recognised

I installed a new Network printer, connected via ethernet to my router.
I can see it as an installed printer, I can ping it, but I cannot see its status nor can I send a file to be printed, unless I disable Comodo.
I obviously have a Comodo configuration issue, but cannot find it.

I run Windows 7, Comodo Firewall latest free version, my printer is a Canon Pixma MG 7550.

Any clew ?

Disable block fragmented IP traffic in firewall advanced settings.

It is solved:

Please next time only post one topic. We do not allow multiple topics about one topic to prevent fragmentation.

Locking this topic.