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Identify upgrade - Firefox Error code: SEC_ERROR_REUSED_ISSUER_AND_SERIAL

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TitleIdentify upgrade - Firefox Error code: SEC_ERROR_REUSED_ISSUER_AND_SERIAL
Symptoms
Error message reported in Firefox browser.
 
Secure Connection Failed. 

Please contact the server administrator or email correspondent and give them the following information: Your certificate contains the same serial number as another certificate issued by the certificate authority. Please get a new certificate containing a unique serial number.

Error code: SEC_ERROR_REUSED_ISSUER_AND_SERIAL 

The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. 
Please contact the website owners to inform them of this problem.
Environment
  • Wireless 
  • Identify
  • 10.21.01.0065
  • Firefox 51.0.1
Cause
After an upgrade of the Extreme wireless controller to version 10.21.01.0065 Firefox 51.0.1 will no longer allow an exception for SSL connections to the web based GUI. 
Resolution

Windows:

1. Close all instances of Firefox
2. Delete C:\Users\%userprofile%\AppData\Roaming\Mozilla\Firefox\Profiles\%profile.default%\cert_override.txt
3. Delete C:\Users\%userprofile%\AppData\Roaming\Mozilla\Firefox\Profiles\%profile.default%\cert8.db
4. Open the web GUI to the controller and set exceptions (see below for workflow).

MAC:

1. Close all instances of Firefox
2. ~/Library/Application Support/Firefox/Profiles/<profile folder> 
3. Delete cert_override.txt & cert9db. 
4. Open the web GUI to the controller and set exceptions (see below for workflow).

Firefox 'Set Exception' Workflow.

  1. Open FireFox 
  2. https://"EWC-ip-here":5825 
  3. Expand 'i understand the risks'
  4. Choose 'add exception'
  5. 'Get certificate'
  6. 'Confirm'
Additional notes
More details about this behaviour in Firefox can be found here: https://bugzilla.mozilla.org/show_bug.cgi?id=435013

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