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

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:


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.

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