ZyXEL Communications NWA5000 SERIES User Manual page 196

If your device's Web Configurator is set to use SSL certification, then the first time you browse to it
1
you are presented with a certification error.
Click Continue to this website (not recommended).
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In the Address Bar, click Certificate Error > View certificates.
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Appendix A Importing Certificates
NWA5000 / WAC6000 Series User's Guide
196