ZyXEL Communications NXC2500 User Manual page 422

In the Certificates dialog box, click the Trusted Root Certificates Authorities tab, select the
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certificate that you want to delete, and then click Remove.
In the Certificates confirmation, click Yes.
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In the Root Certificate Store dialog box, click Yes.
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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
422