SimpleMappingExceptionResolver not catching exceptions from ActiveDirectoryLdapAuthen

Hi,

I have spring security set up to use the ActiveDirectoryLdapAuthenticationProvider to authenticate users.

While testing I stops the AD server and tried to log into my web app. The web app shows a HTTP 500 page with the following exception

Code:

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javax.naming.CommunicationException: adserver.com:389 [Root exception is java.net.ConnectException: Connection refused]

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How do I make the SimpleMappingExceptionResolver catch this exception and show my custom error page?