Avocent DSR 4020 Configuration Guide - Using the Serial Port like a boss

How to Configure The Avocent DSR 4020

The Avocent DSR 4020 is a legacy/old skool keyboard video, mouse (KVM) server with a network management interface, and a DB9 serial port based management interface.  Unfortunately, the remote console feature requires Java JRE 1.6. (6u45)  It has 16 ports.  The bank of RJ45 jacks on the back are NOT network jacks, instead you need to use DSIQ dongles to connect them to video and USB ports on your servers.   You can also get DSIQ dongles with PS/2 connectors.  Both network and serial interfaces can be used to configure the KVM.  The serial interface is a closely guarded secret.  If you bought a used KVM from ebay, you can use Serial to reset and wipe out the password.  The Avocent manuals do not explain this port.  We will explain how to use it.  If you need assistance with your Avocent, call us, we can help.  Consider hiring a real IT pro to properly install your KVM. Check out our low IT services rates at.
Rear ports of the Avocent DSR 4020
The serial port is located above the modem port on the DSR 4020.  Connect a straight thru serial cable to it, it has a male DB9 connector.  Open Le Putty, and create a new connection profile for COM1, if you have a COM1, make it a serial connection, and set the baud rate at 9600.  Hit connect.

DSR 4020 Serial interface
When connected, startup the DSR, and you will see this screen in putty.  You may configure the network interface here. The screen below is what you will see.
DSR Automatic Network Settings
When configured for DHCP, your DHCP server will assign the network address.

Default Admin Password

The default username and password is "Admin" and the password is blank.

This tech tidbit was brought to you by your Southern California IT pros at Eleven Dimensions Technologies.  See our new website for more tech tidbits.   See our tech blogs too.

How to Use the Virtual KVM Session Viewer

First you need to install Java 1.6 from Oracle Historic Java Collection. The KVM Viewer only works with Java JRE 1.6.   Get the 32 bit version of "Java SE Runtime Environment 6u45" Don't try it with JRE 7 or 8.  Click on the KVM Session link and download the file.  Then open the file with javaws.exe. You will then be able to see the virtual console.   Once you install that old version of java, click on the remote console link in your KVM web interface, and download the .CGI files, then you want to associate each with javaws.exe to run them.  You should use IE11 for best results.


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