[Python-modules-team] Bug#960646: Never mind

[Allan Wind]

This can be closed as an user error.

fail2ban is executing two statements and I was able to reproduce 
the non-descriptive error message "Could not process rule: No such 
file or directory'" by running:

nft add set inet filter f2b-sshd \{ type ipv4_addr\; \}

Then I ran the above command with ip instead of inet and it 
worked, and blocked ips were being added chains as verified
by :

nft list table inet filter

On a subsequent restart, fail2ban was now failing with the same
error message but now using ip instead of inet so I reverted the 
change I suggested initially and I was able to run the first 
command as is.

Then I ran the 2nd command:

nft insert rule inet filter INPUT meta l4proto tcp ip saddr @f2b-sshd
reject

and got the same useless error message as before.  I noticed 
earlier that `nft list table inet filter` had the chain
as lowercase input, so I tried that and it worked.  This the 
relevant jail.conf configuration:

[DEFAULT]
chain = input

Previously, I used chain = INPUT with iptables.  Hopefully this 
helps someone else as it had me stumped.