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Logging in to the vSphere Web Client fails with the error: 'Detected duplicate HTTP-based FlexSessions, generally due to the remote host disabling session cookies' (2052445)

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Details

Logging in to the vSphere Web Client fails with a duplicate session error, similar to:
4/19/2012 15:48:45.416 [ERROR] ErrorNotificationManager: faultCode:Server.Processing.DuplicateSessionDetected faultString:'Detected duplicate HTTP-based FlexSessions, generally due to the remote host disabling session cookies. Session cookies must be enabled to manage the client connection correctly.' faultDetail:'null'

Solution

This issue occurs if the vSphere Web Client service was restarted or upgraded while the vSphere Web Client UI was open in a Web browser.
 
To resolve this issue:
  1. Close the Web browser. Be sure to close all tabs and all instances of the browser.
  2. Relaunch the Web browser.
  3. Go to the vSphere Web Client URL and log in.

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