[Nagiosplug-help] Remote command execution failed: Permission denied (publickey, keyboard-interactive).

[J4]

Dear Nagios oracles,

    I have added two services to a Nagios test server.  I would like to
know roughly what misconfiguration I have.

These two errors messages pop up:

[1261054866] SERVICE NOTIFICATION: nagiosadmin;dd52;Swap
Usage;UNKNOWN;notify-service-by-sms;Remote command execution failed:
Permission denied (publickey,keyboard-interactive).

[1261054866] SERVICE NOTIFICATION: nagiosadmin;dd52;Total
Processes;UNKNOWN;notify-service-by-sms;Remote command execution failed:
Permission denied (publickey,keyboard-interactive).

On the Nagios server I can ssh into the target server without a password
(dd52) using the public key.  The user on the Nagios server is nagios,
and the target server is nagios.   Thus, SSH works well.

These are the two services I have in the config file that rests in
/usr/local/nagios/etc/servers/dd52.cfg

# dd52.cfg
define service{
        use                             remote-service         ; Name of
service template to use
        host_name                       dd52
        service_description             Total Processes
        check_command                   check_remote_procs!22!250!400!RSZDT
        #check_command                  check_remote_procs!250!400!RSZDT
        }

define service{
        use                             remote-service         ; Name of
service template to use
        host_name                       dd52
        service_description             Swap Usage
        check_command                   check_remote_swap!22!20!10
        }


The keys are readable by nagios: 
root at abc:/usr/local/nagios/etc/keys# ls -l
total 8
-rw------- 1 nagios nagios 1675 2009-12-17 11:56 dd52
root at abc:/usr/local/nagios/etc/keys# ls -ld
drwxr-x--- 2 nagios nagios 4096 2009-12-17 11:56 .

Of course, if these keys were unreadable then I should have seen an
error message like this, but I have not:
Remote command execution failed: Warning: Identity file
/usr/local/nagios/etc/keys/dd52 inaccessible: No such file or directory.

Has anybody got an idea?

Best wishes.


PS. uname -a : Linux abc 2.6.28-17-generic #58-Ubuntu SMP Tue Dec 1
18:57:07 UTC 2009 i686 GNU/Linux
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