To completely reinstall or upgrade the CSA, you will need to restart the computer. A restart will also be necessary when updating some components including the firewall and the proxy drivers.

After installing the CSA on a computer with IIS 7.0, you must restart the IIS service. IIS 7.0 may not work as expected with the CSA, which uses the Windows Filtering Platform, until IIS is restarted. This issue only occurs on Microsoft Windows 2008 without service pack 2.

Real-time scan on CSA can prevent Hyper-V Manager from creating virtual machines. If you encounter this issue, configure real-time scan to exclude the storage folder for your virtual machines from scanning. Hyper-V Manager uses "C:\ProgramData\Microsoft\Windows\Hyper-V" as the default storage folder, but a different folder may be specified during virtual machine creation.

In environments such as distributed file systems, scanning offline files causes unnecessary file recalls and can eventually lead to performance issues. To avoid scanning offline files:

1. Open the Windows registry and navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tmfilter\Parameters.

2. Set the registry keys SkipOffLineFile and SkipSparseFile to1.

   For more information, refer to http://esupport.trendmicro.com/Pages/How-to-skip-offline-files-from-being-scanned.aspx

The WFBS-SVC_Downloader.exe file can only be run on the computer on which the user downloads it. If a user copies the file to another computer and runs it there, an error results.

Computer loses network connection temporarily during installation.

Users cannot successfully uninstall the agent if Dropbox is installed on the same computer.

Users cannot deploy agent program when Internet Explorer 10 running in Metro mode on Windows 8.

On Windows Vista/2008/7 guest operating systems running VMware ESX 3.5 servers, PccNTmon cannot render the CSA console correctly. The system hangs and eventually crashes.

To prevent this issue:

1. Click Start > Control Panel > Performance Information and Tools > Visual Effects.

2. Select Adjust for best performance.

CSA self-protection for Process and Registry Keys works only on the following 64-bit platforms: Windows Vista SP1 x64 and Windows Server 2008 SP1 x64 and above.

If Client Security is set to High and a malware program resides in the CSA folder before real-time scan starts, CSA cannot restrict that malware from updating the registry.

If virus pattern or spyware active-monitoring pattern files are not available to the CSA, the CSA will keep its current scan method until the pattern is delivered

During CSA installation or firewall driver uninstallation, the computer may temporarily lose its network connection. Some applications, such as Secure Shell (SSH), Terminal Services Client, or Remote Desktop could be affected by the disconnection. If the network connection is lost, restart the application after installing the CSA or after disabling the firewall.

The CSA firewall may conflict with other firewall applications. Trend Micro recommends uninstalling or disabling other firewall applications.

On VMware clients, the CSA firewall may block all incoming packets.

To address this issue, add the following value to the client's registry:

• Key:HKEY_LOCAL_MACHINE\SOFTWARE\TrendMicro\PC-cillinNTCorp\CurrentVersion\PFW

• Name:EnableBypassRule

• Type:REG_DWORD

• Data:1

The firewall does not support IPV6.

On Windows Vista, Windows 7, Windows 8, Windows Server 2008, Windows Server 2008 R2 and Windows Server 2012 computers, if the firewall is disabled and then re-enabled, Firewall patterns fail to load sometimes. To fix this problem, restart the affected computer

Behavior Monitoring supports all 32-bit operating systems and only the following 64-bit platforms: Windows Vista SP1 x64 and Windows Server 2008 SP1 x64 and above.

When running Internet Explorer 9 with IE Enhanced Security Configuration, the Web Reputation plug-in module (TmIEPlugInBHO Class) cannot be automatically applied. Risky URLs using SSL cannot be blocked.

Web Reputation Services and URL Filtering are not supported when Internet Explorer 10 is running in Metro mode on Windows 8.

When Internet Explorer 9 is installed under Windows Small Business Server 2011 Essentials, a popup window concerning unused windows appears when closing the Dashboard console.  

Dashboard Add-in is not compatible with Internet Explorer Enhanced Security Configuration. Ensure this option is disabled before opening the Dashboard.

Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Vista, Windows 7, and Windows 8 computers with UAC enabled prohibit automatic installation.