To follow up on this, I have once more this problem (this time with another server though) and I activated debugging and started to do some deeper research. This time the service 'Disk Space /' on SERVER21 is in state warning. The host alias for SERVER21 is SERVER21-DEVL. The notification looks like this though: Service: Disk Space / Host: SERVER31-UAT Address: 10.x.x.x State: WARNINGAs you see, the alias for SERVER31 was taken, instead of SERVER21. Now if I take a look at var/objects.cache the correct alias is used: define host { host_name SERVER21 alias SERVER21-DEVL If I take a look at var/retention.dat I see something strange: host { host_name=SERVER21 alias=SERVER31-UAT display_name=SERVER21 Taking a further look at retention.dat reveils, that another host took the alias for SERVER31-UAT: host { host_name=SERVER33 alias=SERVER31-UAT display_name=SERVER33 I am sure the problem comes from here (retention.dat). But can somebody explain, how such wrong entries are created in retention.dat ? <div class="gmail_quote">On Mon, Jul 11, 2011 at 5:14 PM, Claudio Kuenzler <<a href="mailto:ck@claudiokuenzler.com">ck@claudiokuenzler.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> This particular one: define service{ use normal-service-trading host_name server14 service_description Service Check check_command check_nrpe!proxy_bs_connections } So there's no alias entry either. It's the very first time that this happens, and it continues. The service is still down (in maintenance) but Nagios continues to send the notification with a wrong HOSTALIAS. <div><div></div><div class="h5"> <div class="gmail_quote">On Mon, Jul 11, 2011 at 4:50 PM, Terry Carmen <<a href="mailto:terry@cnysupport.com" target="_blank">terry@cnysupport.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div>Quoting Claudio Kuenzler <<a href="mailto:ck@claudiokuenzler.com" target="_blank">ck@claudiokuenzler.com</a>>: > Hello, > > Since today I have almost the same problem as Jim. > The $HOSTALIAS$ macro works fine for all the checks, except one host alias > is wrong. I got aware of it today. > > Same version as Jim's, 3.2.3, compiled from source as well. > > Host config: > > define host{ > use linux-platform-demo ; Name of host > template to use > ; This host > definition will inherit all variables that are defined > ; in (or inherited > by) the linux-server host template definition. > host_name server14 > alias SERVER14-RANDOMDEMO > address 192.168.0.14 > } > </div>What does your service definition look like? Terry ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. <a href="http://p.sf.net/sfu/splunk-d2d-c2" target="_blank">http://p.sf.net/sfu/splunk-d2d-c2</a> <div><div></div><div>_______________________________________________ Nagios-users mailing list <a href="mailto:Nagios-users@lists.sourceforge.net" target="_blank">Nagios-users@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/nagios-users" target="_blank">https://lists.sourceforge.net/lists/listinfo/nagios-users</a> ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null </div></div></blockquote></div> </div></div></blockquote></div>