LDAP support doesn't work in cluster

Logging in to the second node in a cluster fails because of an problem in the LDAP group cache (GroupCache). The following exception is written to the logs:

java.lang.IllegalArgumentException: Group unknown: [com.atlassian.user.impl.cache.GroupCache$1@502a39] in [hibernateRepository]
at com.atlassian.user.impl.hibernate.HibernateGroupManager.validateGroupAndUser(HibernateGroupManager.java:507)
at com.atlassian.user.impl.hibernate.HibernateGroupManager.hasMembership(HibernateGroupManager.java:490)
at com.atlassian.user.impl.delegation.DelegatingListGroupManager.hasMembership(DelegatingListGroupManager.java:219)
at bucket.user.DefaultUserAccessor.hasMembership(DefaultUserAccessor.java:468)
at bucket.user.DefaultUserAccessor.hasMembership(DefaultUserAccessor.java:491)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:284)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:155)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:122)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:56)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174)
at $Proxy16.hasMembership(Unknown Source)
at com.atlassian.confluence.util.GeneralUtil.isSuperUser(GeneralUtil.java:793)