Make sure the supervisor can connect to the database.
Read SSL:
I get an error "Database not available" or
"Unavailable database" when starting the Ruby supervisor.
Firebird Client must run on the RUBY Supervisor PC.
In the folder "C:\Program Files\Datatex\Ruby2\Supervisor" you
must have one of the following files"
fbclient.dll
gds32.dllIf not copy it from the RUBY server to the RUBY Supervisor PC.