App-V: Application Virtualization 4.x NTA Logging Options

In App-V, Network Transport Access logging is turned off by default. It can be turned on for diagnostics when the network is experiencing latency, authentication,  or other connectivity-related issues within a traditional Microsoft Application Virtualization environment using the RTSP (Real-Time Streaming Protocol) transport.By default, the App-V NTA log file is named Sftnta.txt. The Sftnta.txt file is located in the following folder:

%ProgramFiles%\Microsoft Application Virtualization Client\

The following log levels are available:

Level	Description
0xFFFFFFFF	All logging
0x00000000	No logging
0x0000FFFF	All errors
0x00000001	Socket errors
0x00000002	General errors and control flow
0x00000004	RTP errors
0x00000008	RTCP errors
0x00010000	Information
0x00020000	NTA interface
0x00040000	Session creation and deletion
0x00080000	RTSP connection creation and deletion
0x00100000	RTP packets received
0x00200000	RTCP packets received

To enable an NTA log, follow these steps:

1.) Start Registry Editor.

Expand the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SoftGrid\4.5\Client\Configuration

Create a DWORD value (REG_DWORD) that is named NtaLogMask.

In the Value Data box, type the log level that you want. Then, under Base, select Hexadecimal.

Exit Registry Editor.

Stop the Application Virtualization Client service. Then, restart the Application Virtualization Client  service.

Note: The NTA log causes the Sftnta.txt file to grow fairly large over a short time. This action can adversely affect client performance. Only use the NTA log if Microsoft support recommends that you use the log to diagnose specific client problems. Once you have enabled NTA logging and collected the diagnostic information, please remove the registry entry and restart the Application Virtualization Client  service.