On my network computer, the Probe Service icon has a green light indicating to me that it is running and that there is connection to OD SDP. 

Within the OD SDP application under Setup > Probe, the icon has a red light. To me this indicates that it is not connected to the Probe.

I have been running scans for the last few days and this is the second time where I appear to have lost connection between the OD SDP and the Probe. The first time it happened, I had to create a new Probe and then register the Probe on the client to get it to work. I then had to reconnect all Domain / Networks scans to the new Probe. 

I checked the logs and the Client Probe shows last connection of 5 minutes ago, but the Probe on the ODSDP Web Page shows last connection 7 hours ago.