Re: [syslog-ng] Syslog-ng not receiving messages

17 Nov 2010


      do you have any iptables rules? `iptables -nvL`  `iptables -nvL -t nat` 
`iptables -nvL -t mangle`
About the only thing I can think of off the top of my head. There might 
be some sysctl option to disable UDP, but I dont know it if it does exist.

Sent: Wed Nov 17 2010 16:39:57 GMT-0700 (Mountain Standard Time)
From: keshava V <mv.keshava@gmail.com>
To: Syslog-ng users' and developers' mailing list 
<syslog-ng@lists.balabit.hu>
Subject: Re: [syslog-ng] Syslog-ng not receiving messages
...
Looks like it is getting blocked somewhere as you thought. How come 
tcpdump output is seeing all the udp syslog-ng messages?
[root@aspsyslog ~]# /etc/init.d/syslog-ng start
Starting syslog-ng:                                        [  OK  ]
[root@aspsyslog ~]# /etc/init.d/syslog-ng stop
Stopping syslog-ng:                                        [  OK  ]
[root@aspsyslog ~]# nc -u -l 514
getting nothing...!
On Wed, Nov 17, 2010 at 5:34 PM, Patrick H. <syslogng@feystorm.net 
<mailto:syslogng@feystorm.net>> wrote:
Ok, lets see if the problem is before it gets to syslog-ng or
    after. Shut syslog-ng down and do 'nc -u -l 514' and see if it
    gets anything. That'll dump out all traffic received. If it gets
    it, the problem is syslog-ng, if it doesnt get it the traffic is
    getting blocked somehow.
Sent: Wed Nov 17 2010 16:30:12 GMT-0700 (Mountain Standard Time)
From: keshava V <mv.keshava@gmail.com> <mailto:mv.keshava@gmail.com>
    To: Syslog-ng users' and developers' mailing list
    <syslog-ng@lists.balabit.hu> <mailto:syslog-ng@lists.balabit.hu>
    Subject: Re: [syslog-ng] Syslog-ng not receiving messages
...
syslog-ng is using 514 as expected.
[root@aspsyslog ~]# netstat -upnl | grep ":514"
    udp        0      0 0.0.0.0:514
    <http://0.0.0.0:514>                
    0.0.0.0:*                               8789/syslog-ng
Thanks
On Wed, Nov 17, 2010 at 5:27 PM, Patrick H.
    <syslogng@feystorm.net <mailto:syslogng@feystorm.net>> wrote:
There isnt something already listening on udp 514 is there?
        netstat -upnl | grep ":514"
Sent: Wed Nov 17 2010 16:23:44 GMT-0700 (Mountain Standard Time)
        From: keshava V <mv.keshava@gmail.com>
        <mailto:mv.keshava@gmail.com>
        To: Syslog-ng users' and developers' mailing list
        <syslog-ng@lists.balabit.hu> <mailto:syslog-ng@lists.balabit.hu>
        Subject: Re: [syslog-ng] Syslog-ng not receiving messages
...
Further,
I have tried setting the kernel parameters without any luck
[root@aspsyslog ~]# sysctl -w net.core.rmem_max=8388608
        [root@aspsyslog ~]# sysctl -w net.core.rmem_default=1048576
[SNIP]
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