Monday, November 15, 2010

Cisco UCS C Series Server CIMC’s Launch KVM Console throws messages: “The KVM Viewer requires Java 1.5 or higher. Please install or enable Java and try again.”

I ran into a strange problem that stumped me for a good 30 minutes before I figured out what the issue was. What’s funny is that the problem was actually quite simple but seeing how I spent a good half hour to be able to fix it, I figured it’d be worth a blog post.

Server: Cisco UCS C210 M2

Management Server: Windows Server 2008 R2 64-bit

Browser: Internet Explorer 32-bit

What basically happened was that whenever I tried to launch the KVM Console from within the Cisco Integrated Management Controller, I would receive the following message:

The KVM Viewer requires Java 1.5 or higher. Please install or enable Java and try again.


After going through the:

  1. Ensured Java was installed.
  2. Check the security permissions for the IP address of the CIMC.
  3. Ensure Java plug-in was enabled.
  4. Ensure the security permissions for Java within IE was set to allow.

What I finally realized was that when I installed Java earlier in the week via the Java website, it automatically installed the 64-bit version. Seeing how the Internet Explorer icon always defaults to 32-bit, the 32-bit Internet Explorer wasn’t aware and couldn’t use the 64-bit plugin.


The solution was simple: install Java 32-bit:


Hope this helps anyone out there that runs into such a trivial issue.


netrack raj said...

KVM Consoles controls the devices with pairs of components

netrack raj said...

KVM Consoles switches are very used in Server rooms

Anonymous said...

simple? Sounds like you had to troubleshoot for a bit

L A Bridge Hosting, Co-location, DSL and Fiber said...

Thank you sooo much for posting this. I'm running into the same issue trying to upgrade CIMC. There's a new feature coming out from Cisco that will allow sending of e-mail from the CIMC when it detects a problem on the host. IN preparation for this release we should all get familiar with the process. Cisco has a video on the general upgrade process at

There's a bit more about similar problems encountered during this process at

I'm running into a new problem, once getting passed the 32 bit java issue, where launching KVM fails with an error about revoked certificate, I found that you have to disable all security checks in the Java control panel to get beyond this.

• Perform TLS certificate revocation checks on (Check 'Do not check')
• Perform signed code certificate revocation checks on (Check 'Do not check')

This leaves your OS vulnerable so one would want to use a throwaway VM to do this work.