ZyXEL Communications NXC5200 User Manual page 626

Appendix D Importing Certificates
In the Certificates dialog box, click the Trusted Root Certificates Authorities
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tab, select the certificate that you want to delete, and then click Remove.
In the Certificates confirmation, click Yes.
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In the Root Certificate Store dialog box, click Yes.
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The next time you go to the web site that issued the public key certificate you just
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removed, a certification error appears.
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NXC5200 User's Guide