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I have imported the certificate into device, and there is no certificate error when accessing to WAN interface GUI.
However, when the client is redirected to login portal, it still shows certificate error.
When the client is redirected to login portal, device will redirect LAN interface to the client.
Because the certificate is signed for WAN interface, when accessing to LAN interface the certificate shows error due to IP mismatch.
You can enter the command to force redirect URL to be WAN FQDN to avoid certificate error issue.
Router(config)# web-auth redirect-fqdn DOMAIN-NAME-OF-CERTIFICATE
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