ZyXEL Communications NSA 210 User Manual page 477

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 259
In the Delete Web Site Certificates dialog box, click OK.
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Figure 260 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.
Opera
The following example uses Opera 9 on Windows XP Professional; however, the
screens can apply to Opera 9 on all platforms.
NSA210 User's Guide
Firefox 2: Certificate Manager
Appendix D Importing Certificates
477