Install webmin on Linux - CentOS, Fedora, Debian or Ubuntu

Download webmin from here.

1) If your Linux distribution is yum based like CentOS or fedora,
Download rpm file of webmin and install it using 

$ sudo rpm -ivh webmin-installation-filename.rpm

If your Linux distribution is dpkg(deb) based like ubuntu or debian,
Download deb file of webmin and install it using 

$ sudo dpkg -i webmin-installation-filename.deb

2) Now webmin is installed and we can access it using port 10000, Open it.

https://localhost:10000

3) If your firewall prevents to access webmin using other system of same LAN, you should define port 10000 in iptables.
Add following line in /etc/sysconfig/iptables

-A INPUT -m state --state NEW -m tcp -p tcp --dport 10000 -j ACCEPT

4) Restart iptables

$ sudo service iptables restart

5) Now you can access it using

https://ip-of-the-server:10000

6) username, password of webmin is same as root's username & root's password of the server.

webmin - Security Warning

Warning! Webmin has detected that the program 

https://IP-address:10000/right.cgi?open=system&open=status was linked to from an unknown URL, which appears to be outside the Webmin server. This may be an attempt to trick your server into executing a dangerous command.

First Method :

• Login as root, and edit the /etc/webmin/config file.
• Find the line referers_none=1 and change it to referers_none=0.
• Save the file.

Second Method :

• Login to Webmin normally.
• Go to the Webmin Configuration module.
• Click on the Trusted Referrers icon.
• Check the Trust links from unknown referrers box, and click Save.

Final Method :

If above both methods do not work, follow this.

Open following link in chrome

https://localhost:10000/webmin/edit_referers.cgi

Select radio button NO for Referrer checking enabled?

Now try again.

webmin - Error - Bad Request

Open webmin url with https

The correct url is https://localhost:10000/webmin