I was looking for the X509 store.  I found it  at /volume1/@apphome/EmbyServer/.dotnet/corefx/cryptography/x509stores/ca Inside the folder is  the PEM file. I renamed it backup.txt   and restarted Emby Server  to test. ash-4.4# pwd /volume1/@apphome/EmbyServer/.dotnet/corefx/cryptography/x509stores/ca ash-4.4# del 48504E974C0DAC5B5CD476C8202274B24C8C7172.pfx  ash: del: command not found ash-4.4# mv 48504E974C0DAC5B5CD476C8202274B24C8C7172.pfx backup.txt ash-4.4# ls backup.t