How to Modify the Default Webmin’s Port Number on CentOS 5.7

To improve the security on my linux centOS server, it is recommended to change the default port of the service and change it to custom webmin’s port number. In this post i will show you on how to modify the default port, 10000 to 10101.

Check default port number :

[root@CentOS57 ~]# netstat -plunt | grep perl
tcp        0      0 0.0.0.0:10000               0.0.0.0:*                   LISTEN      4521/perl   
udp        0      0 0.0.0.0:10000               0.0.0.0:*                               4521/perl  

Where is the webmin port number stored?
Webmin port number store in /etc/webmin/miniserv.conf

To modify the default port, 10000 to 10101, open the /etc/webmin/miniserv.conf file and modify line 1 and 16.

1 port=10101
..
..
16 listen=10101
..

Sample configuration file :

[root@CentOS57 ~]# vi /etc/webmin/miniserv.conf

port=10101
root=/usr/local/webmin
mimetypes=/usr/local/webmin/mime.types
addtype_cgi=internal/cgi
realm=Webmin Server
logfile=/var/webmin/miniserv.log
errorlog=/var/webmin/miniserv.error
pidfile=/var/webmin/miniserv.pid
logtime=168
ppath=
ssl=0
env_WEBMIN_CONFIG=/etc/webmin
env_WEBMIN_VAR=/var/webmin
atboot=1
logout=/etc/webmin/logout-flag
listen=10101
denyfile=\.pl$
log=1
blockhost_failures=5
blockhost_time=60
syslog=1
session=1
premodules=WebminCore
server=MiniServ/1.570
userfile=/etc/webmin/miniserv.users
keyfile=/etc/webmin/miniserv.pem
passwd_file=/etc/shadow
passwd_uindex=0
passwd_pindex=1
passwd_cindex=2
passwd_mindex=4
passwd_mode=0
preroot=blue-theme
passdelay=1

Restart webmin service using this command:

[root@CentOS57 ~]# /etc/webmin/restart
Stopping Webmin server in /usr/local/webmin
Starting Webmin server in /usr/local/webmin
Pre-loaded WebminCore

Check the modified webmin’s port number

[root@CentOS57 ~]# netstat -plunt | grep perl
tcp        0      0 0.0.0.0:10101               0.0.0.0:*                   LISTEN      4750/perl   
udp        0      0 0.0.0.0:10101               0.0.0.0:*                               4750/perl

Now you can access the Webmin through url with new custom port.
http://serverip:10101