ZyXEL Communications ZYWALL USG 20 Manual page 844

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.
Note: There is no confirmation when you remove a certificate authority, so be
absolutely certain you want to go through with it before clicking the button.
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ZyWALL USG 20/20W User's Guide