Windows 10 Windows Defender Firewall is blocking printing

[RoyGrubb]

I have a Canon LBP 5050N printer on my LAN at a fixed IP address (192.168.0.10). This is a new PC running Windows 10 Build 19041 (i.e. the latest, May edition).

Windows Defender Firewall is blocking printing. If I turn WDF off for private networks, printing operates.

I've looked at Advanced Settings > Monitoring > Firewall and in the long list of entries I've looked at the 8 Blocked ones. All relate to Public networks, none of these have any relevant name for printer spooling. But there are entries for Canon CAPT Port and Canon Printer, all of which seem to allow pass-through:

Name Profile Action Override Direction Program Local Address Remote Address Protocol Local Port Remote Port Authorized Users Authorized Computers Authorized Local Principals Local User Owner Application Package Group Status
Canon CAPT Port Public Allow No Inbound Any Any Any UDP 50366 Any Any Any Any Any Any OK
Canon CAPT Port Public Allow No Inbound Any Any Any UDP 51985 Any Any Any Any Any Any OK
Canon CAPT Port Private Allow No Inbound Any Any Any UDP 55663 Any Any Any Any Any Any OK
Canon printer All Allow No Inbound Any Any Any UDP 3756 Any Any Any Any Any Any OK


I have not made any manual adjustments to WDF other than to turn it off to allow printing and then turn it back on again.


How do I give the Spooler SubSystem permission to pass through the WDF?


Thanks

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