This issue happens because the default Scan before delivering option for the handling method is incompatible with applet instrumentation or signature validation.
To use Java applet instrumentation or signature validation, Trend Micro recommends using "Deferred scanning" as the large file handling method.
Please do the following:
- Log on to the InterScan Web Security Suite (IWSS) 3.1 for Windows management console.
- Go to HTTP > Policies.
- Click the policy name and then go to the Virus Scan Rule tab.
- Under the Large File Handling section, select the Deferred scanning: deliver part of the page without scanning... option.
- Click Save.