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UFW config w/ NBD connections
https://community.online.net/t/enable-ufw-in-debian-or-ubuntu-results-in-lock-out/2118/2
Set the default INPUT policy to ACCEPT: Edit /etc/default/ufw and set:
DEFAULT_INPUT_POLICY="ACCEPT"
Append a drop-all rule to the INPUT chain: Edit /etc/ufw/after.rules, add this line just before the final COMMIT line:
-A ufw-reject-input -j DROP
Disable UFW logging (this seems to cause issuses with Scaleway's default kernel):
ufw logging off
Enable UFW (don't forget to allow SSH traffic):
ufw allow ssh;
ufw enable
That's it, UFW is up and running, and NBD shouldn't cause issues.
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