ZyXEL Communications NXC2500 User Manual page 427

In the Certificate Manager dialog box, select the Web Sites tab, select the certificate that you
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want to remove, and then click Delete.
In the Delete Web Site Certificates dialog box, click OK.
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The next time you go to the web site that issued the public key certificate you just removed, a
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certification error appears.
Appendix C Importing Certificates
NXC Series User's Guide
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