ZyXEL Communications ZYWALL USG 20 Manual page 828

Appendix D Importing 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.
Firefox
The following example uses Mozilla Firefox 2 on Windows XP Professional;
however, the screens can also apply to Firefox 2 on all platforms.
If your device's Web Configurator is set to use SSL certification, then the first time
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you browse to it you are presented with a certification error.
Select Accept this certificate permanently and click OK.
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Figure 474 Firefox 2: Website Certified by an Unknown Authority
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ZyWALL USG 20/20W User's Guide