[[FATAL]] [[DBT-06103]] The port (5,500) is already in use [duplicate]

Question

This question already has answers here:

Resolving port 5500 not free issue during Oracle 12c Release 2 Database Configuration Assistant installation on CentOS (3 answers)

Closed 9 months ago.

I am trying to install oracle 18c XE on CentOS 7. I have opened the ports:

firewall-cmd --permanent --add-port=1521/tcp
firewall-cmd --permanent --add-port=1630/tcp
firewall-cmd --permanent --add-port=3938/tcp
firewall-cmd --permanent --add-port=1830/tcp
firewall-cmd --permanent --add-port=1849/tcp
firewall-cmd --permanent --add-port=1158/tcp
firewall-cmd --permanent --add-port=5500/tcp
firewall-cmd --permanent --add-port=5519/tcp
firewall-cmd --permanent --add-port=5520/tcp
firewall-cmd --permanent --add-port=5539/tcp
firewall-cmd --permanent --add-port=5540/tcp
firewall-cmd --permanent --add-port=5559/tcp
firewall-cmd --permanent --add-port=5560/tcp
firewall-cmd --permanent --add-port=5579/tcp
firewall-cmd --permanent --add-port=5580/tcp
firewall-cmd --permanent --add-port=5599/tcp
firewall-cmd --permanent --add-port=5600/tcp
firewall-cmd --permanent --add-port=5620/tcp
firewall-cmd --permanent --add-port=5640/tcp
firewall-cmd --permanent --add-port=5659/tcp
firewall-cmd --permanent --add-port=5660/tcp
firewall-cmd --permanent --add-port=5679/tcp
firewall-cmd --reload

When trying /etc/init.d/oracle-xe-18c configure the following error is displayed:

Specify a password to be used for database accounts. Oracle recommends that the password entered should be at least 8 characters in length, contain at least 1 uppercase character, 1 lower case character and 1 digit [0-9]. Note that the same password will be used for SYS, SYSTEM and PDBADMIN accounts:
Confirm the password:

Passwords do not match.  Enter the password:
Confirm the password:
Configuring Oracle Listener.
Listener configuration succeeded.
Configuring Oracle Database XE.
[FATAL] [DBT-06103] The port (5,500) is already in use.
   ACTION: Specify a free port.

Database configuration failed. Check logs under '/opt/oracle/cfgtoollogs/dbca'.

I searched and found its due to hostname configuration:

[root@linux ~]# cat /etc/hostname
linux.mydomain.com

[root@linux ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain 
163.173.24.179  linux.mydomain.com

[root@linux ~]# hostname
linux.mydomain.com

[root@linux ~]# hostname -f
linux.mydomain.com

UPDATE-1

[root@linux oracle]# grep -w 5500 /etc/services
fcp-addr-srvr1  5500/tcp                # fcp-addr-srvr1
fcp-addr-srvr1  5500/udp                # fcp-addr-srvr1

UPDATE-2:

[root@linux oracle]# sudo nmap -sT -O localhost

Starting Nmap 6.40 ( http://nmap.org ) at 2020-06-03 20:57 CEST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.0014s latency).
Not shown: 986 closed ports
PORT     STATE SERVICE
21/tcp   open  ftp
25/tcp   open  smtp
53/tcp   open  domain
106/tcp  open  pop3pw
110/tcp  open  pop3
111/tcp  open  rpcbind
143/tcp  open  imap
465/tcp  open  smtps
993/tcp  open  imaps
995/tcp  open  pop3s
1521/tcp open  oracle
3306/tcp open  mysql
8009/tcp open  ajp13
8443/tcp open  https-alt
Device type: general purpose
Running: Linux 3.X
OS CPE: cpe:/o:linux:linux_kernel:3
OS details: Linux 3.7 - 3.9
Network Distance: 0 hops

OS detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 3.38 seconds
[root@linux oracle]# sudo nmap -sU -O 163.172.24.189

Starting Nmap 6.40 ( http://nmap.org ) at 2020-06-03 20:58 CEST
Nmap scan report for linux.mydomain.com (163.172.24.189)
Host is up (0.000048s latency).
Not shown: 997 closed ports
PORT    STATE         SERVICE
53/udp  open          domain
111/udp open          rpcbind
776/udp open|filtered wpages
Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
Device type: webcam|general purpose|phone|storage-misc
Running: AXIS Linux 2.6.X, Linux 2.6.X, ZyXEL embedded
OS CPE: cpe:/h:axis:210a_network_camera cpe:/h:axis:211_network_camera cpe:/o:axis:linux_kernel:2.6 cpe:/o:linux:linux_kernel:2.6 cpe:/o:google:android:2.2 cpe:/h:zyxel:nsa-210
OS details: AXIS 210A or 211 Network Camera (Linux 2.6), Linux 2.6.14 - 2.6.34, Linux 2.6.17, Linux 2.6.17 (Mandriva), Android 2.2 (Linux 2.6), ZyXEL NSA-210 NAS device
Network Distance: 0 hops

OS detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 7.01 seconds
[root@linux oracle]# sudo nmap -sT -O 163.172.24.189

Starting Nmap 6.40 ( http://nmap.org ) at 2020-06-03 21:04 CEST
Nmap scan report for linux.mydomain.com (163.172.24.189)
Host is up (0.0014s latency).
Not shown: 986 closed ports
PORT     STATE SERVICE
21/tcp   open  ftp
25/tcp   open  smtp
53/tcp   open  domain
80/tcp   open  http
106/tcp  open  pop3pw
110/tcp  open  pop3
111/tcp  open  rpcbind
143/tcp  open  imap
443/tcp  open  https
465/tcp  open  smtps
993/tcp  open  imaps
995/tcp  open  pop3s
1521/tcp open  oracle
8443/tcp open  https-alt
Device type: general purpose
Running: Linux 3.X
OS CPE: cpe:/o:linux:linux_kernel:3
OS details: Linux 3.7 - 3.9
Network Distance: 0 hops

OS detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 3.38 seconds

Please advise where I am making mistake?

Best Regards

Answer 1

The short name of your host is missing from /etc/hosts, only the FQDN is there. It should be:

163.173.24.179 linux.mydomain.com linux

linux (hostname -s) is unreachable due to this.