ZyXEL Communications GS-4012 - Manual (Page 420)

Chapter 52 Troubleshooting
GS-4012F/4024 User’s Guide
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Figure 208 Security Settings - Java Scripting
52.2.1.3 Java Permissions
1 From Internet Explorer, click Tools, Internet Options and then the Security tab.
2 Click the Custom Level... button.
3 Scroll down to Microsoft VM.
4 Under Java permissions make sure that a safety level is selected.
5 Click OK to close the window.
Figure 209 Security Settings - Java