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

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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 :

[[email protected] ~]# 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

Also Read :   Nginx Reverse Proxy Setup for Linux Server

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 :

[[email protected] ~]# 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:

[[email protected] ~]# /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

[[email protected] ~]# 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


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