If you uninstall, delete, or replace a certificate on Mobile Device Manager (MDM) Device Management Server in the company network, you must remove the certificate from MDM Gateway Server and then install a new certificate.
To manually remove a certificate
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Open Internet Information Services (IIS) Manager. Expand the tree in the navigation pane, right-click Gateway Management Web site, and then select Properties.
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On the Propertiespage, choose the Directory Securitytab. In the Secure Communicationsbox, choose Server Certificate.
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The Web Server Certificate Wizardappears. Choose Nextto continue to the Modify the Current Certificate Assignmentpage.
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Select Remove the current certificate, and then choose Next.
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The Remove a Certificatepage appears. Choose Next, and then choose Finish.