Hi,
I've installed an 11g Express Database on Linux Ubuntu 18.04 and want to access from another Mac Book or Windows PC the database. My Listenter is up and runing. But I can not access via SQLDeveloper (JDBC Connection) from Mac or Windows. I turned the firewall on and off no success. A "telnet <IP Adr> 1521" is refusing connection either when firewall is turned on or off??? Is there something I'm not thinking about?
I forgot to mention that on the host itself a telnet <IP Adr> 1521 works fine.
cheers,
Bernhard