How to disable manager and host-manager configurations

Issue

• How to disable manager and host-manager configurations?
• We have applications that do not use the host manager or manager directories in $EWS_HOME/tomcat6/webapps and would like to disble them.
• If I try to rename them I get the following errors:

SEVERE: Error starting static Resources
java.lang.IllegalArgumentException: Document base /tomcat6/webapps/host-manager does not exist or is not a readable directory
        at org.apache.naming.resources.FileDirContext.setDocBase(FileDirContext.java:142)
        at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4320)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4489)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
        at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:675)
        at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:601)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:502)
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
        at org.apache.catalina.core.StandardService.start(StandardService.java:525)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:803)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:596)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

Aug 26, 2014 2:30:18 PM org.apache.catalina.core.StandardContext start
SEVERE: Error in resourceStart()
Aug 26, 2014 2:30:18 PM org.apache.catalina.core.StandardContext start
SEVERE: Error getConfigured
Aug 26, 2014 2:30:18 PM org.apache.catalina.core.StandardContext start
SEVERE: Context [/host-manager] startup failed due to previous errors
Aug 26, 2014 2:30:18 PM org.apache.catalina.core.StandardContext stop
INFO: Container org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/host-manager] has not been started
Aug 26, 2014 2:30:18 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor host-manager.xml
Aug 26, 2014 2:30:19 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor manager.xml