ZyXEL Communications ZyWALL 110 Handbook page 368

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If you uploaded a logo to show in the SSL VPN user screens but it does not display
properly, check that the logo graphic is in GIF, JPG, or PNG format. The graphic
should use a resolution of 103 x 29 pixels to avoid distortion when displayed. The
ZyWALL/USG automatically resizes a graphic of a different resolution to 103 x 29
pixels. The file size must be 100 kilobytes or less. Transparent background is
recommended.
If users can log into the SSL VPN but cannot see some of the resource links check
the SSL application object's configuration.
If the ZyWALL/USG redirects the user to the user aware screen, check whether the
user account is included in an SSL VPN access policy or not.
Changing the HTTP/HTTPS configuration disconnects SSL VPN network extension
sessions. Users need to re-connect if this happens.
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