09-04-2018
NAGIOS Service not able to open port on AIX 7.1
I have an AIX 7.1 LPAR where Nagios agent was installed for monitoring. The issue is that when I start the nagios service (ncpa_listener), it starts but does not open the 5693 port it requires for communication. On all other LPARs the service opens the port and is listening. I tried reinstalling the agent. Sometimes, when I try to stop the service it goes into a stopping state and has to be killed forcefully. The oslevel is 7100-05-01-1731. The LPAR has about 120GB of memory and 6 CPUs as entitled capacity. This is an Oracle DB DR server. Please let me know if more details are required.
I tried to see if there is anything using the port using netstat -an | grep 5693. I also checked the services file to see if any service is already using this port, but there was nothing in both cases.
------ Post updated at 12:22 PM ------
I just wanted to add one more thing. If I do a "telnet localhost 5693", I don't get a telnet prompt. But on all other LPARs, the telnet connects and gives a prompt. I can't seem to think of a reason why the service should not be able to open an unused port.
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LEARN ABOUT DEBIAN
bb-services
BB-SERVICES(5) File Formats Manual BB-SERVICES(5)
NAME
bb-services - Configuration of TCP network services
SYNOPSIS
$BBHOME/etc/bb-services
DESCRIPTION
bb-services contains definitions of how bbtest-net(1) should test a TCP-based network service (i.e. all common network services except HTTP
and DNS). For each service, a simple dialogue can be defined to check that the service is functioning normally, and optional flags deter-
mine if the service has e.g. a banner or requires SSL- or telnet-style handshaking to be tested.
FILE FORMAT
bb-services is a text file. A simple service definition for the SMTP service would be this:
[smtp]
send "mail
quit
"
expect "220"
options banner
This defines a service called "smtp". When the connection is first established, bbtest-net will send the string "mail
quit
" to the
service. It will then expect a response beginning with "220". Any data returned by the service (a so-called "banner") will be recorded and
included in the status message.
The full set of commands available for the bb-services file are:
[NAME] Define the name of the TCP service, which will also be the column-name in the resulting display on the test status. If multiple
tests share a common definition (e.g. ssh, ssh1 and ssh2 are tested identically), you may list these in a single "[ssh|ssh1|ssh2]"
definition, separating each service-name with a pipe-sign.
send STRING
expect STRING
Defines the strings to send to the service after a connection is established, and the response that is expected. Either of these may
be omitted, in which case bbtest-net(1) will simply not send any data, or match a response against anything.
The send- and expect-strings use standard escaping for non-printable characters. "
" represents a carriage-return (ASCII 13), "
"
represents a line-feed (ASCII 10), " " represents a TAB (ASCII 8). Binary data is input as "xNN" with NN being the hexadecimal
value of the byte.
port NUMBER
Define the default TCP port-number for this service. If no portnumber is defined, bbtest-net(1) will attempt to lookup the portnum-
ber in the standard /etc/services file.
options option1[,option2][,option3]
Defines test options. The possible options are
banner - include received data in the status message
ssl - service uses SSL so perform an SSL handshake
telnet - service is telnet, so exchange telnet options
FILES
$BBHOME/etc/bb-services
SEE ALSO
bbtest-net(1)
Xymon Version 4.2.3: 4 Feb 2009 BB-SERVICES(5)