you need to add the correct accounts to appfabric group (add app pool accounts to that group)
Log in to the front end server and select Start then right click on
Computer and select Manage (or Start > Administrative Tools > Server
Expand the options then expand Configuration then expand Local Users
First, find the WindowsFabricAdministrators group and make sure that
the SharePoint Farm account is a member – if it is not, add it.
Next, for each of the application pool accounts, make sure they are
members of the following groups:
•IIS_USRS •WSS_WPG •WindowsFabricAllowedUsers
Just realised what your trying todo!
no you cannot access workflow managment site from browser! its command line only and hence why your getting 403 response!
providing a customizable monitoring solution, and providing a rich
management toolset, all of which can be directly accessed through the
IIS management console or scripted using the AppFabric modules for
AppFabric Hosting Services and Hosting Administration enable you to
perform health monitoring and troubleshooting of running WCF and WF
services, and to control those services. You do so in the AppFabric
Dashboard page of the IIS Manager
Windows PowerShell cmdlets for AppFabric that you can use to perform
management tasks on applications and services. You can do so
interactively in the Windows PowerShell console, or script management
tasks with cmdlets. These cmdlets provide the functionality behind
much of the AppFabric application management UI.
To open the AppFabric management tools UI, click Start, All Programs,
and then Windows Server AppFabric.
You can also use the Windows Server Manager to work with AppFabric.
Open the Server Manager by clicking Start, Administrative Tools, and
then Server Manager. "Windows Server AppFabric" is listed under the
Application Server node under Roles. You can right-click the Windows
Server AppFabric entry to display commands for opening IIS Manager
with AppFabric extensions or the Windows PowerShell cmdlets for
AppFabric. In the center pane, you can also find links to online
resources and administrator tips.