A network administrator sets up MAC-Auth and captive portal to Aruba ClearPass on AOS-Switches. The solution seems to work for most guests. However, some guests open their browsers and are not redirected to the captive portal.
How should the administrator address the likely cause of the issue?
A. Set the RADIUS server time window to 0 because some guest computers likely have the incorrect system time.
B. Replace MAC-Auth on switch ports with Web-Auth because this authentication method offers more reliability with captive portal.
C. Reconfigure the captive portal URL hash key on some of the switches, which likely have the wrong password.
D. Replace expired certificates on the switches and set their usage to captive portal since some guests have an HTTPS homepage.
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