NRPE: Unable to read output

[Marcus]

Hi Folks,

i'm trying to get a plugin for openvpn 
(http://www.nagiosexchange.org/cgi-bin/pages/Detailed/1315.html) to work 
with nrpe, but it gives me the dreaded "NRPE: Unable to read output"-error.

The server is a sles10sp1-xen-host running openvpn with the 
management-console which is reachable via telnet on localhost:1195.

When i run the check manually, it works, although there is no "Linefeed" 
  at the end.(Wonder if that might be the problem?)

The invocation-command basically looks like this:
nagios at u-23:/usr/local/nagios/libexec> 
/usr/local/nagios/libexec/check_openvpn -H 127.0.0.1 -p 1195 -P mypwd -n

Then the output is (on one line):
OpenVPN OK: 0 connected 
clients.nagios at u-239-s087:/usr/local/nagios/libexec>

Perl::Telnet is used to connect to tcp/1195, gives the pwd and checks 
how many clients are connected.

My nrpe.cfg looks like this:

command[check_vpn]=/usr/local/nagios/libexec/check_openvpn -H 127.0.0.1 
-p 1195 -P mypwd -n

When i issue

nagios at u-23:/usr/local/nagios/libexec> 
/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1 -c check_hd
DISK OK - free space: / 9334 MB (86% inode=96%);| 
/=1424MB;9067;10200;0;11334

it works great, however

nagios at u-23:/usr/local/nagios/libexec> 
/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1 -c check_vpn

results in

NRPE: Unable to read output

Can anybody please give me a hint whats going wrong here. :-/

Thanks and greetings,
   Marcus

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