Just did an upgrade, and when the system came up most of my devices were red/down. Ping from both sides were ok. Testing the connection under log settings did not help. I figured I would give the FortiAnalyzer a reboot, and after that all was back to normal.. just as a tip for anyone wanting to upgrade..
The Fortinet Security Fabric brings together the concepts of convergence and consolidation to provide comprehensive cybersecurity protection for all users, devices, and applications and across all network edges.