> > Chain INPUT (policy ACCEPT 22M packets, 55G bytes)
> >  pkts bytes target     prot opt in     out     source     
> destination
> >     0     0            tcp  --  *      *       0.0.0.0/0  
> 127.0.0.1           tcp dpt:8876
> 
> Your rule is incorrect. I'll quote myself:
> > iptables -I INPUT -s client_addr -d backuppc_server_addr -p tcp 
> > --sport 22

The source port *isn't* 22, because nothing is travelling through port
TCP 22. As far as I can see while backups are running ("netstat -na |
grep 8873"):

storebox:~# netstat -na | grep 8873
tcp        0      0 127.0.0.1:8873          0.0.0.0:*       
tcp        0      0 127.0.0.1:8873          127.0.0.1:56713 
tcp        0      0 127.0.0.1:56713         127.0.0.1:8873  
tcp6       0      0 ::1:8873                :::*            

And iptables shows the parts I already posted (showing data transfer
happening on that 8873 TCP port).

> So, change --sport to --dport and vice-versa.
> 
> > iptables -I INPUT -d localhost -p tcp --dport 8873
> 
> should be
> 
> > iptables -I INPUT -d localhost -p tcp --sport 8873

I'll be trying it for the next backup run (tonight).

Regards,
Flavio.

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