Looks like you haven't opened up sftp(port 115) in Shorewall.  Post on the
shorewall-us...@lists.sourceforge.net list.  Tom Eastep is very helpful.

If it were fail2ban blocking traffic, you would see it in the log file.

Note if you're not using fail2ban with ipsets actions instead of iptables, 
you're
going to run into problems if you do a 'shorewall restart'.  It will clear your 
bans.

If you still think the problem could be fail2ban, post your config, action, and 
log
files.

Bill

On 8/8/2017 1:42 PM, Davide Marchi wrote:
Hi friends,
I tell you immediately that I am not clear whether the matter concerns Shorewall rather than Fail2ban, so you have pity for me :-)


I've configured ProFtpd to connect by tls (SSLv3 TLSv1 -> Letsencypt certificate) and if I stop shorewall the "sftp" connection works fine,
but with Shorewall up, it DROP the connection:


Aug 8 18:50:10 server kernel: [16438563.572121] Shorewall:net-fw:DROP:IN=eth0 OUT= MAC=00:50:56:3c:a8:50:00:08:e3:ff:fd:90:08:00 SRC=132.142.22.10 DST=44.320.032.111 LEN=60 TOS=0x00 PREC=0x00 TTL=56 ID=63283 DF PROTO=TCP SPT=33175 DPT=55298 WINDOW=29200 RES=0x00 SYN URGP=0



Now I wondering where is the problem,

I don't know if is Fail2ban to tell to Shorewall to Drop this connection or if 
I should open a specific question on Shorewall ML.



Many thanks to all!

Davide
Italy

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