Issue Resolved. TCP_wrappers was the culprit.
R, D. From: Dermot Duffy Sent: 06 December 2011 17:04 To: nagios-users@lists.sourceforge.net Subject: CHECK_NRPE: Error - Could not complete SSL handshake Hi, I have installed the following on a RHEL 5.4 blade server: - nagios-3.2.1 - nagios-plugins-1.4.11 - nrpe-2.12 Install went smoothly, compiled without error. Now trying to connect to my nagios server and get the following: # /usr/local/nagios/libexec/check_nrpe -H localhost CHECK_NRPE: Error - Could not complete SSL handshake. Port appears to be listening: [root@node2 ~]# netstat -at | grep nrpe tcp 0 0 *:nrpe *:* LISTEN [root@node2 ~]# netstat -plan | grep 5666 tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN 22482/xinetd Messages log shows the following: 2011-12-06T16:54:22.553812+00:00 node2 xinetd[2154]: libwrap refused connection to nrpe (libwrap=nrpe) from 127.0.0.1 2011-12-06T16:54:22.553834+00:00 node2 xinetd[2154]: FAIL: nrpe libwrap from=127.0.0.1 2011-12-06T16:54:22.554039+00:00 node2 xinetd[22482]: START: nrpe pid=2154 from=127.0.0.1 2011-12-06T16:54:22.554104+00:00 node2 xinetd[22482]: EXIT: nrpe status=0 pid=2154 duration=0(sec) My /etc/xinetd.d/nrpe is configured correctly as I have got several other servers (same spec) working fine. I get the following from my nagios server when trying to telnet the port: [root@nagios_server]# telnet node2 5666 Trying 192.168.235.50... Connected to ocmp2.brandtone.lan (192.168.235.50). Escape character is '^]'. Connection closed by foreign host. R, D. ____________________________________________________________________________________________________________________________________________________________________________________________ [Description: Description: Description: Description: Brandtone Side Bar logo cropped] Dermot Duffy IT Infrastructure Technical Lead www.brandtone.ie<http://www.brandtone.ie/> | dermot.du...@brandtone.ie<mailto:dermot.du...@brandtone.ie> M: +353 85 711 7530 Disclaimer The information contained in this message (including any attachments) is confidential and intended solely for the attention and use of the named addressee(s). It must not be disclosed to any person without our authority. If you are not the intended recipient, please delete it from your system immediately - any disclosure, copying or distribution thereof or any action taken or omitted to be taken in reliance thereon is prohibited and may be unlawful. BrandTone Limited makes no warranty as to the accuracy or completeness of any information contained in this message and hereby excludes any liability of any kind for the information contained therein or for the transmission, reception, storage or use of such information in any way whatsoever. Any opinions expressed in this message are those of the author and do not necessarily reflect the opinions of BrandTone Limited.
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