Re: [solved] Postfix-Server behind a DSL-Router

Friday, 10 April 2015

So, hello again!

I "sort of" solved the problem by completely turning off my firewalld.

	# systemctl stop firewalld.service
and to make it permanent:
	# systemctl disable firewalld.service

(Just in case: Fedora docs say the same could be done with 
iptables.service).
Of course this solution is not optimal - but firewall setup is a subject 
for a new thread.

Big thanks to everybody on this list for your patient and competent 
advice. That gave me a good starting experience  with Fedora Community 
and my new server system.

I will now unsubscribe pukruppa(a)googlemail.com from this list - my new 
address ulrich(a)pukruppa.de is already on-line.

Thanks again

Peter

Am 09.04.2015 um 12:07 schrieb Peter Ulrich Kruppa:
...
 Hi everyone,

 please do excuse my unspecific subject - I don't really know what my
 problem is yet.

 I set up a Postfix-Server on my Fedora 21 box, which is connected to
 the internet via
 some Netgear Router. My private LAN is 192.168.10.0/24 with the Fedora
 box fixed on
 192.168.10.1 . My Netgear thing has got a fixed IP and hostname, let's say for
 mydomain.com .

 Now I can
    - send myself mails from my Fedora box
    - send mails from my Fedora box to the outside p. ex. my googlemail account

 but I can't receive mails from outside.

 When I do a
      # tcpdump -n -i any tcp port 25
 on my Fedora I can see many messsages like

 10:34:09.338691 IP 212.227.17.11.64945 > 192.168.10.1.smtp: Flags [S],
 seq 3273717964, win 14600, options [mss 1418,sackOK,TS val 1273019143
 ecr 0,nop,wscale 9], length 0
 10:34:10.339378 IP 212.227.17.11.64945 > 192.168.10.1.smtp: Flags [S],
 seq 3273717964, win 14600, options [mss 1418,sackOK,TS val 1273019393
 ecr 0,nop,wscale 9], length 0
 [...]

 Any good ideas, what else I can do to analyze my problem?

 Thanks for your answers

 Peter
 .