Hyperion Planning Error "Failure of Server APACHE Bridge Internal Processing Error" When Deploying Application

Hyperion Planning - Version 11.1.2.3.000 to 11.1.2.3.501 [Release 11.1]
Information in this document applies to any platform.

Symptoms

Hyperion Planning application fails to deploy or redeploy. The following error message is displayed:
Failure of Server APACHE Bridge Internal Processing Error

Cause

Directory /tmp/_wl_proxy/ is not accessible for the user account running EPM System services.

Solution

Make sure that the user accounts running the Hyperion services have access to /tmp/_wl_proxy/. If you have a couple of the Hyperion environments running on a Unix server make sure that each owner has access to this directory.
You may find that Environment 1 has access but Environment 2 does not, or it only has Read access.  As an example the /tmp/_wl_proxy/ had permissions defined as 750.  If both Environment 1 and Environment 2 are members of the same group change /tmp/_wl_proxy to 770 and try to deploy your application again. 
There is no need to restart the services after changing the permissions.