It's hard to determine the root cause, here are some ideas:
- The date and time on the Protect server needs to be sync/corrected.
- A proxy or other web-based filter is blocking the traffic from Protect to the cloud site.
- You previously had a Protect console registered to the cloud with the same login information. You must unregister both consoles and then register the current console. Only one console can be associated with a logon.
Logs would tell you more, you can enable verbose logging by going to Tools > Options > Logging and set it to All. Restart Protect and attempt to force a Full Sync in Tools > Operations > Protect Cloud Sync. The logs are located here: C:\Windows\ProPatches\Logs
There's no telling which log will show the error since we don't know what the root cause is, but the errors should be at the bottom.