Cannot print until I flush iptables

Cannot print until I flush iptables

 
I have installed iptables-persistent, done iptables -F, iptables-save to /etc/iptables/rules.v4 and 6, reboot. I find I cannot print on a network connected printer, or log in to my router, but I can access the internet. If I flush iptables again, it all works. If I compare the listing of iptables before and after reboot, they are different. Ubuntu 20.04.1, connected to network by ethernet. How can I fix this

 

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