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How to renew a user certificate

if you got an email with that content, this manual will help you to renew your user certificate:
go to https://ca.cern.ch
click on 'Request or renew user certificate using Mozilla browser'
enter your password and birth date and click 'Next'
click 'Submit'
click on 'Install this certificate'
go back to https://ca.cern.ch
click 'List and revoke certificates'
check if the new certificate is there: 2 new entries with the new certificate expiration date
choose the firefox menu Edit→Preferences, Advanced, 'View Certificates'
remove the old certificate

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