Fix a broken link to a blog posting on the Spring website

docs/manual/src/docs/asciidoc/index.adoc

@@ -4322,7 +4322,7 @@ When we've used the attribute `IS_AUTHENTICATED_ANONYMOUSLY` to grant anonymous
 
 [[authz-custom-voter]]
 ===== Custom Voters
-Obviously, you can also implement a custom `AccessDecisionVoter` and you can put just about any access-control logic you want in it. It might be specific to your application (business-logic related) or it might implement some security administration logic. For example, you'll find a http://blog.springsource.com/2009/01/02/spring-security-customization-part-2-adjusting-secured-session-in-real-time/[ blog article] on the SpringSource web site which describes how to use a voter to deny access in real-time to users whose accounts have been suspended.
+Obviously, you can also implement a custom `AccessDecisionVoter` and you can put just about any access-control logic you want in it. It might be specific to your application (business-logic related) or it might implement some security administration logic. For example, you'll find a http://spring.io/blog/2009/01/03/spring-security-customization-part-2-adjusting-secured-session-in-real-time[ blog article] on the Spring web site which describes how to use a voter to deny access in real-time to users whose accounts have been suspended.
 
 
 [[authz-after-invocation-handling]]