"403 forbidden" Error when editing "Content Sources" in SharePoint 2013 to Configure the Search.

Errors:

"403 forbidden" Error when editing "Content Sources" in SharePoint 2013 to Configure the Search.

(Or)

"403 forbidden" error when adding "New Content Source" in SharePoint 2013 to Configure the Search.

(Or)

Faulting application name: hostcontrollerservice.exe, version: 15.0.4420.1017, time stamp: 0x50672c2d
Faulting module name: KERNELBASE.dll, version: 6.1.7601.17965, time stamp: 0x506dcae6
Exception code: 0xe0434352
Fault offset: 0x000000000000bccd
Faulting process id: 0xeb0
Faulting application start time: 0x01ceefdd94d681b1
Faulting application path: D:\Program Files\Microsoft Office Servers\15.0\Search\HostController\hostcontrollerservice.exe
Faulting module path: C:\Windows\system32\KERNELBASE.dll

(Or)

Application: hostcontrollerservice.exe

Framework Version: v4.0.30319

Description: The process was terminated due to an unhandled exception.

Exception Info: System.ServiceModel.CommunicationException

Stack:

   at Microsoft.Ceres.HostController.WcfServer.WcfService.StartService()

   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)

   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)

   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)

   at System.Threading.ThreadHelper.ThreadStart()

Reason:

Microsoft only knows the actual reason. :) But 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.