Invalid Http response

Troubleshooting UCSM Login Errors After Java 7 Update 45

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If you just updated your management workstation to Java 7 Update 45, you might find yourself locked out of Cisco UCS Manager (UCSM). This is a known issue caused by a change in how Java handles HTTP responses, which unfortunately breaks the communication handshake with certain UCSM versions.

The Symptoms

When attempting to launch the UCSM Java client, you will likely encounter one of these two frustrating login errors:

  • Error 1: Login Error: java.io.IOException: Invalid Http response
  • Error 2: Login Error: java.io.IOException: Server returned HTTP response code: 400 for URL: http://x.x.x.x:443/nuova

The Cause: Cisco Bug CSCuj84421

This issue is officially tracked under Cisco Bug ID CSCuj84421. The security enhancements introduced in Java 7u45 changed the way the Java Runtime Environment (JRE) processes headers, leading to the “400 Bad Request” error when reaching out to the UCS virtual IP.

The Workaround: The Rollback

Until you can upgrade your UCSM firmware to a version that is compatible with newer Java releases, the most reliable solution is to downgrade your JRE.

  1. Uninstall Java 7 Update 45 from your system via the Control Panel.
  2. Download and Install an earlier version.
    • Java 7 Update 25: Confirmed as the most stable version for this specific bug.
    • Java 7 Update 40: Also reported to work by many in the Cisco community.
  3. Clear your Java Cache: After downgrading, go to the Java Control Panel > General > Temporary Internet Files > View, and delete the UCSM application entries to ensure a fresh launch.

Note: Always remember to disable “Check for Updates Automatically” in the Java Control Panel after rolling back, or you’ll find yourself back in the same position tomorrow morning!

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