ZyXEL Communications NSA-220 Plus User Manual page 350

Appendix D Importing Certificates
Opera
The following example uses Opera 9 on Windows XP Professional; however, the
screens can apply to Opera 9 on all platforms.
If your device's Web Configurator is set to use SSL certification, then the first time
1
you browse to it you are presented with a certification error.
Click Install to accept the certificate.
2
Figure 189 Opera 9: Certificate signer not found
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NSA-220 Plus User's Guide