Comment 2 for bug 512131

I see the issue. For now you can workaround this by adjusting /lib/ufw/user*.rules and remove these lines:
### RATE LIMITING ###
-A ufw-user-limit -m limit --limit 3/minute -j LOG --log-prefix "[UFW LIMIT BLOCK] "
-A ufw-user-limit -j REJECT
-A ufw-user-limit-accept -j ACCEPT
### END RATE LIMITING ###

Then perform:
$ sudo ufw relead

Verify with:
$ sudo ufw show raw|grep 'LIMIT BLOCK'