We recently had a problem with one of our groups in that none of the five WMI sensors were gathering information (though
It turned out that Microsoft's Threat Gateway was configured to allow traffic on port 135 from the remote probe but the IP address of that probe within the gateway was incorrectly configured, so the connections from the actual probe were being dropped.
Now we fixed the IP address and three of the sensors started working again (cpu, uptime, memory) but the free disk and memory are both still reporting:
> Connection could not be established (800706BA: The RPC server is unavailable - Host: MACHINE, User: USERID, Password: PASSWORD, Domain: ntlmdomain:DOMAIN) (code: PE015)
They're all using the same credentials and I cannot figure out any differences between them that would explain the discrepancy.