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On the login page, you can type any username and any password and click "Login". For example, “User name: user” and “Password: pass” like below.
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You can access the unit via HTTPS (HTTP with SSL only) using InfiNet Wireless self-signed certificate (from the "General" menu of Web interface - "Allow HTTPS OnlyAllow HTTPS Only"). The «HTTPS Connection» link is available in the right side of the «Login» «Login» button like in the picture above.