# Antivirus Exclusions

Installing antivirus software on an RD Session Host server greatly affects overall system performance, especially the CPU usage. We highly recommend that you exclude all folders that hold temporary files from the active monitoring list, especially folders generated by services and other system components.

The Parallels RAS folder to be excluded from real-time scanning is `%programfiles(x86)%\Parallels\ApplicationServer`.

For Parallels RAS port reference, please refer to **Parallels Remote Application Server Administrator's Guide**, which can be downloaded from <http://www.parallels.com/products/ras/resources>. For additional information, please also see <http://kb.parallels.com/124003>.

The Parallels Client for Windows folder to be excluded from real-time scanning is as follows:

* 32-bit: `%programfiles(x86)%\Parallels\Client`
* 64-bit: `%programfiles%\Parallels\Client`

Parallels recommends to exclude the above Parallels RAS and Parallels Client for Windows folders from real-time or on-access scanning and scan them on a regular basis using scheduled scans. You should also monitor the creation of new files in the excluded folders.

## **FSLogix anti-virus exclusions for Windows Defender ATP**

Make sure to configure the following antivirus exclusions for FSLogix Profile Container virtual hard drives.

Exclude files:

* %Programfiles%\FSLogix\Apps\frxdrv.sys
* %Programfiles%\FSLogix\Apps\frxdrvvt.sys
* %Programfiles%\FSLogix\Apps\frxccd.sys
* %TEMP%\*.VHD
* %TEMP%\*.VHDX
* %Windir%\TEMP\*.VHD
* %Windir%\TEMP\*.VHDX
* \\\storageaccount.file.core.windows.net\share\*\*.VHD (Azure and Azure Virtual Desktop only)
* \\\storageaccount.file.core.windows.net\share\*\*.VHDX (Azure and Azure Virtual Desktop only)

Exclude processes:

* %Programfiles%\FSLogix\Apps\frxccd.exe
* %Programfiles%\FSLogix\Apps\frxccds.exe
* %Programfiles%\FSLogix\Apps\frxsvc.exe


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