ServerBuddies Support Blog

How to change default 19368 port of control panel interface.

To change default 19638 port it is enough to change it in /etc/ensim/epl.conf file and restart epld service. In other configuration files it will be substituted accordingly.

Note that the sites configuration files are located in /etc/httpd/conf/virtual/ and include “RedirectMatch” directive that contain redirect to 19638 port.

Get exim to listen on another port other than 25

Some ISP’s are now blocking outgoing port 25 which prevents user from using smtp via their server. The workaround is to get exim to listen on another port other than 25 to bypass the ISP’s block.

For example, to get exim to listen on both port 25 and port 587, you’d add the following code to the very top of the /etc/exim.conf file:

Once saved, restart exim:
Redhat:
/sbin/service exim restart

FreeBSD:
/usr/local/etc/rc.d/exim restart

More: http://www.exim.org/exim-html-4.40/doc/html/spec_13.html#SECT13.5

How to check if the port is associated with the official list of known services.

Example:

This command returns no output. This indicates that while the port is in the reserved range (meaning 0 through 1023) and requires root access to open, it is not associated with a known service.

Next, check for information about the port using netstat or lsof. To check for port 834 using netstat, use the following command:

The lsof command reveals similar information since it is also capable of linking open ports to services:

These tools reveal a great deal about the status of the services running on a machine. These tools are flexible and can provide a wealth of information about network services and configuration. Consulting the man pages for lsof, netstat, nmap, and services is therefore highly recommended.

How to redirect port using IPTABLES

You can redirect the port in IPTABLES using the prerouting parameter.

Following is the command you can use to redirect the traffic of port 8080 to port 80.

You can change the ports in the above command according to your need.

How to redirect port using IPTABLES

You can redirect the port in IPTABLES using the prerouting parameter.

Following is the command you can use to redirect the traffic of port 8080 to port 80.

You can change the ports in the above command according to your need.