[syslog-ng] syslog-ng forwarding and processing issue

Szalai, Attila Attila.Szalai at morganstanley.com
Wed Sep 28 14:02:50 CEST 2016


In case of udp, the syslog source should handle receiving logs with old and the new version too. (But that is more an exception than the rule, so matching the receiver and the sender is a good idea generaly.)

Before anything else I would check if the logs arrive to the anonymizer host or not. The statistics can help on this. Also, if there are parsing issue, the syslog-ng would tell this through its log.

After that starting the syslog-ng with enabled debug logs can also help on discovering what happening with the received log.

From: syslog-ng-bounces at lists.balabit.hu [mailto:syslog-ng-bounces at lists.balabit.hu] On Behalf Of Fekete, Róbert
Sent: Wednesday, September 28, 2016 1:47 PM
To: Syslog-ng users' and developers' mailing list
Subject: Re: [syslog-ng] syslog-ng forwarding and processing issue


The destination on your remote server and the source on the pseudomizer host do not match: the first one uses the udp() driver (RFC3164 protocol), while the second uses the syslog() driver (RFC5424) protocol.

Change the destination driver to syslog() on the remote server. (For more possibilities, see https://www.balabit.com/documents/syslog-ng-pe-latest-guides/en/syslog-ng-pe-guide-admin/html/concepts-things-to-consider.html )



On Wed, Sep 28, 2016 at 1:17 PM, Denis Dolinský <denis.dolinsky at gmail.com<mailto:denis.dolinsky at gmail.com>> wrote:
Hi guys,
I have following setup in place:
remote server -
pseudomizer - syslog-ng PE in client mode -
So I am sending syslog logs from remote server to pseudomizer:
source src { internal()};
destination dst { udp (" port (514);};
log { source(src); destination (dst);
this is very old config from syslog v4
Then on pseudomizer - syslog-ng LTS 6.0.1 PE, I am collecting the logs, processing them - removing private data, putting pseudonyms instead and forwarding them to SIEM.

source s_net_udp514 {

source src {
        system ();

destination d_net_udp514 {
         syslog (
rewrite r_rewrite {
subst("admin", "pseudonym000001", value("MESSAGE"), flags("global"));

log {
        source(s_net_udp514); source (src);
        rewrite(r_rewrite); # do the pseudomizing
On SIEM device, I can see only pseudomizer internal logs (src), not processed logs from remote server.
Any advice ?
Many thanks.

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