Hi Tom --
We use the ipmiutil [ipmiutil][1] to gather IPMI information. To test it directly, you can run this command line:
"C:\program files (x86)\pa server monitor\ipmiutil.exe" sensor -N {host-ip-address} -U {username} -P {password} -c -t -w
Note that the command line parameters are case sensitive.
My guess is this is firewall related. You can copy ipmiutil.exe along with libeay32.dll and ssleay32.dll to a folder on a different computer (nearer to the DRAC so there are no firewalls in between) and try it there.there.
[1]: http://ipmiutil.sourceforge.net/