check_esx3 error "Permission to perform this operation was denied"

Today I was setting up VMware vSphere Hypervisor (ESXi 5.0) on a new server. Since I'm on the Kool-aid, the first thing I do when setting up a server is getting some kind of Nagios monitoring going. For several years, on ESXi servers, I have been using op5's check_esx3 plugin. Today was the first time I had set up an ESXi 5.0 server though, and when I first ran it after creating my Nagios user in ESXi I got the following error:

Permission to perform this operation was denied

Nagios Plugin - check_rss

As IT moves towards the cloud there are certain things we can't monitor effectively with Nagios, so I made a plugin to check RSS feeds. Many cloud services offer an RSS feed with their status. check_rss allows you to parse these feeds either looking for certain keywords that exist (or don't) or the date of the last post.

Nagios Check - check_temp_weathergoose

I wrote a check for Nagios to check (and convert to Fahrenheit) the temperature for a Weathergoose environmental monitor.

Nagios Check - check_users (Windows)

   I wrote a check for Nagios to tell you the number of users logged in to a machine, as well as the last person logged in.