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Windows Process Activation Service – Error 13: The data is invalid Print

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Exchange 2013 server WWW Publishing Service was stopped. When I tried to start the service it failed on a dependency. A quick check revealed the Windows Process Activation Service (WAS) was stopped. When I tried to start WAS I received the following error.

Windows could not start the Windows Process Activation Service service on Local Computer Error 13 The data is invalid

 

The applicationHost.config file was messed up. For me the file was completely empty. Not a line of code to be found.

IIS takes backups that can be found in C:\INETPUB\HISTORY. Under here you will see several folders with a prefix of CFGHISTORY. The folder with the highest revision number will be your latest backup. Copy this file and overwrite the existing file at C:\WINDOWS\SYSTEM32\INETSRV\CONFIG.

 

applicationHost.config

Once the file has been replaced start the WAS service.

Windows Process Activation Service (WAS)

WAS starts successfully then you should be able to start the WWW Publishing Service.


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