Hello Tom,
thank you very much for taking the time to complete my problem and the
extensive expertise.
>
> According to the Shorewall Dump that you submitted, the firewall is
> *not* blocking the connection:
>
> Chain loc-fw (1 references)
> ...
> 1 60 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0
> tcp dpt:5665 /* ICINGA */
>
> This indicates that the SYN packet sent by the client was accepted by
> the firewall's ruleset. Note that the loc-fw display in your previous
> post, three connections had been accepted.
I believe you mean this here:
0 0 ACCEPT tcp -- * * 192.168.1.70
192.168.1.66 tcp dpt:5665 /* ICINGA */
0 0 ACCEPT tcp -- * * 192.168.1.75
192.168.1.66 tcp dpt:5665 /* ICINGA */
0 0 ACCEPT tcp -- * * 192.168.1.84
192.168.1.66 tcp dpt:5665 /* ICINGA */
0 0 ACCEPT tcp -- * * 192.168.1.85
192.168.1.66 tcp dpt:5665 /* ICINGA */
The sources are the Icinga-agents which should send their messages to Icinga-
master om 192.168.1.66. I think it wasn't inside the rules because I tried
several posibilities.
>
> The server is listening on this port:
>
> Netid State Recv-Q Send-Q Local Address:Port Peer
> Address:Port ...
> tcp LISTEN 0 128 0.0.0.0:5665 0.0.0.0:*
> users:(("icinga2",pid=80706,fd=18))
>
> so I see no reason why the connection would not be successful.
>
> If you temporarily execute 'shorewall clear', does the connection
> succeed (be sure to 'shorewall start' after the test)?
>
Okay, when I clear the rules of shorewall on this way, I get the same result
when I do
# nc -vt 192.168.1.66 5665
neckar.germany.com [192.168.1.66] 5665 (?) : Connection refused
So I would also say, this could be a problem of Icinga configuration.
But then I don't understand this behaviour when shorewall is running on
192.168.1.66:
neckar ~# nc -vt 192.168.1.66 5665
neckar.germany.com [192.168.1.66] 5665 (?) open
> > My host is with its two interfaces vmbr0 and
> > vmbr1 part of both networks net and loc, and named as $FW. I don't
> > understand this behaviour.
>
> The host is *not* part of net and loc -- it is it's own zone named 'fw',
> which is what $FW expands to. This is explained at
> http://www.shorewall.org/Introduction.html.
That I have seen today when I was reading your documentation today.
When the firewall is correctly running in your view, so I have search the
refused connection at Icinga. Apart from the connection behavior on the host,
as just shown.
Best regards
Andreas
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