NSClient reports “Request string contained illegal metachars!”

I as recently compiling an external script within Nagios XI to run using the NSClient where upon execution I was receiving the following message in the nsclient.log:

2013-11-21 17:02:10: error:modules\CheckExternalScripts\CheckExternalScripts.cpp:202: Request string contained illegal metachars!

This is due to the NRPE daemon by default not accepting the use of the the characters `&><‘”\[]{} in arguments.

In order to resolve the issue I had to enable the ‘allow_nasty_meta_chars’ setting for External Scripts and restart the NSClient++ service:

[External Script]
allow_nasty_meta_chars=1
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