Could not complete SSL handshake

[Shashank Rachamalla]

Hi 

I am using Nagios with NRPE to monitor my lab infrastructure and I am
facing this issue of SSL handshake failing with NRPE. The exact error as
displayed in syslog is:

Aug 18 04:15:23 nrpe[15581]: Error: Could not complete SSL handshake. 5 


The following is displayed in /var/log/nrpe at the same time:

09/8/18 at 04:15:39: START: nrpe pid=16259 from=10.201.214.90
09/8/18 at 04:15:41: START: nrpe pid=16260 from=10.201.214.90
09/8/18 at 04:15:46: START: nrpe pid=16274 from=10.201.214.90
09/8/18 at 04:15:49: START: nrpe pid=16275 from=10.201.214.90
09/8/18 at 04:15:56: START: nrpe pid=16276 from=10.201.214.90
09/8/18 at 04:16:02: EXIT: nrpe status=0 pid=16128 duration=286(sec)
09/8/18 at 04:16:02: EXIT: nrpe status=0 pid=16199 duration=156(sec)
09/8/18 at 04:16:16: START: nrpe pid=16291 from=10.201.214.90
09/8/18 at 04:16:25: EXIT: nrpe status=0 pid=16176 duration=220(sec)
09/8/18 at 04:16:26: START: nrpe pid=16292 from=10.201.214.90
09/8/18 at 04:16:34: EXIT: nrpe status=0 pid=16260 duration=53(sec)
09/8/18 at 04:16:36: EXIT: nrpe status=0 pid=16229 duration=125(sec)
09/8/18 at 04:16:51: EXIT: nrpe status=0 pid=16194 duration=215(sec)
09/8/18 at 04:17:07: START: nrpe pid=16307 from=10.201.214.90
09/8/18 at 04:17:17: START: nrpe pid=16308 from=10.201.214.90
09/8/18 at 04:17:21: EXIT: nrpe status=0 pid=16275 duration=92(sec)
09/8/18 at 04:17:35: EXIT: nrpe status=0 pid=16274 duration=109(sec)
09/8/18 at 04:17:46: EXIT: nrpe status=0 pid=16291 duration=90(sec)
09/8/18 at 04:17:46: EXIT: nrpe status=0 pid=16292 duration=80(sec)


What does the above error mean?

Does it have anything to do with network issues? 

Why is the duration high at this time for a few requests while normally
it is less than 5 sec?


I am running nrpe as a service under xinetd with the following
configuration: ( /etc/xinetd.d/nrpe )

# default: on
# description: NRPE (Nagios Remote Plugin Executor)
service nrpe
{
        flags           = REUSE
        socket_type     = stream    
        port            = 5666    
        wait            = no
        user            = nagios
        group           = nagios
        server          = /usr/local/nagios/bin/nrpe
        server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
        log_type        = FILE /var/log/nrpe
        log_on_failure  += USERID ATTEMPT
        disable         = no
        only_from       = 10.201.214.90 
        per_source      = UNLIMITED
        cps             = 50 30
}


Thanks,
Shashank.





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