Cannot poll ESXi 5.5 servers on NPM 11.01

Hi,

I have a really wierd issue in that I cannot poll esxi 5.5. servers. I have made sure credentials are all correct etc but it just never polls it whn adding the node and ticking the poll for vmware option. I know it works for my other ESXI servers on version 5.1 so now I am thinking that it s not compaitble or there is something else is required with 5.5.

anyone else got 5.5. working?

thanks,

Paul