Looks like the Lets Encrypt ssl cert expires after 60 days and needs to be renewed manually. Though the documentation “https://github.com/OpenDroneMap/WebODM” says
"That's it! The certificate will automatically renew when needed."
but my certificate has expired and no luck even after restarting with “./webodm.sh restart --ssl”…
I had to start in non-ssl mode and then ssl mode to have the new cert. Has anyone faced this situation or any other way to automate?