I know this error has already been intensively discussed in this thread here: Resolving port 5500 not free issue during Oracle 12c Release 2 Database Configuration Assistant installation on CentOS

However, despite the solutions proposed I can't install Oracle 12c on CentOS 7.

I skiped the Database Configuration Assistant during standard installation process in order to run it again using Xming. There it is possible to enter the EM database express port manually.

Database Configuration Assistant

I tried almost any port number, I always get the error message shown in the screenshot.

Do you have any suggestions what else I could do?


Content of /etc/hostname:


Content of /etc/hosts: localhost localhost.localdomain localhost4 localhost4.localdomain4
::1       localhost localhost.localdomain localhost6 localhost6.localdomain6 CentOS-Dev-db-12c.Company.local
  • Please provide the contents of /etc/hostname and /etc/hosts – Andrew Brennan Sep 1 '17 at 11:40
  • Are you using a shortened hostname at any point in the process? If you call the host CentOS-Dev-db-12c without the .Company.Local, this will not resolve. – Andrew Brennan Sep 1 '17 at 13:59
  • Can you ping the hostname from the command prompt? ping CentOS-Dev-db-12c.Company.local – Andrew Brennan Sep 1 '17 at 14:00
  • try including the shortened hostname in /etc/hosts e.g. CentOS-Dev-db-12c.Company.local CentOS-Dev-db-12c – Andrew Brennan Sep 1 '17 at 14:02

Oracle support doc [DBT-06103] The port (5,500) is already in use. ACTION: Specify a free port (Doc ID 2277154.1) says to put the unqualified hostname into /etc/hosts too. i.e: CentOS-Dev-db-12c.Company.local CentOS-Dev-db-12c

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