"Please enter a valid fully qualified domain name."

[alezzawi]

"Please enter a valid fully qualified domain name."

i do not have FQDN
what should i do ??

[Tobi]

You could use:
„panel.server.local“

[24unix]

The use of .local is discouraged.

In earlier days MSCE were taught to use .local, but that was ever since a bad idea.

.local is used for Bonjour (Zeroconf/Avahi).

Also look at: https://en.wikipedia.org/wiki/.local

For my machines at home, I use lab.24unix.net with a local PowerDNS responsible for lab.24unix.net and for resolving, so I don't rely on either my provider or shaby companies like Google or Cloudflare.