Error:
403 forbidden when click to content source
Reason:
The "Tasks" folder in the server does not have "Read" & "Write" access for the WSS_WPG account.
Solution:
You need to provide the Read & Write access permission to the "WSS_WPG" user in "C:\Windows\Tasks" folder.
More
Open Command Prompt
Type the command attrib –s %windir%\tasks
Open the folder %windir%\Tasks in Windows Explorer
Inside the folder, right-click and select Security tab
Grant to the WSS_WPG and WSS_ADMIN_WPG the Full Control permission
Restart IIS using...
