ZyXEL Communications NSA221 User Manual page 415

In the Certificate Manager dialog box, select the Web Sites tab, select the
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certificate that you want to remove, and then click Delete.
Figure 254
In the Delete Web Site Certificates dialog box, click OK.
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Figure 255 Firefox 2: Delete Web Site Certificates
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.
NSA221 User's Guide
Firefox 2: Certificate Manager
Appendix D Importing Certificates
415