ZyXEL Communications MAX-306M1 User Manual page 56

Chapter 5 Tutorials
Under Available Services, select HTTP(TCP:80) then click the Add button.
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Repeat this for CU-SEEME(TCP/UDP:7648,24032).
This blocks all web and video chat traffic, while leaving other ports open for other
types of traffic, such as ports 25 and 587 for e-mail and port 21 for FTP.
The Blocked Services window updates accordingly.
Next, configure the Schedule to Block area with the days and hours for blocking
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web access to your employees.
In this example, the five weekly work days are selected as well as the standard
work hours of 3:30 PM to 8:30 PM (or 20:30 in 24-hour format).
Finally, click Apply to save your settings.
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User's Guide