Overall Hardware Status has state "could not poll"

Hi,

As the title really, one of my switches has the above state, I have restarted the polling service on the server to no avail, I don't really want to delete the node and re-add it as it is one of our core switches.

Any ideas?

Also as a side note only a handful of my Cisco devices are reporting hardware status, how do I get them all to report?

Thanks in advance.