You can revoke a client certificate from the command line on the CommServe server.
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Download the revoke_certificate_template.xml file and save it to the software_installation_directory/Base folder on the CommServe server where you will be running the command. 
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Open a command window on the server, and then navigate to the software_installation_directory/Base folder. 
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Execute the following command, replacing $[clientName] with the name of the client computer for which you want to revoke all certificates: qoperation execute -af revoke_certificate_template.xml -clientName clientName