ZyXEL Communications NSA221 User Manual page 111

Next, let's modify the certificate by changing the Common Name to this NSA's
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host name of "nsa", the Organization to "Test" and the Key Length to 2048.
Maintenance > SSL > Edit a Self-Signed Certificate
The NSA restarts its network services and returns you to the login screen.
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Maintenance > SSL > Edit a Self-Signed Certificate
NSA221 User's Guide
Chapter 4 Tutorials
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