Auto LDAP/Active Directory/Confluence synchronization receives error and terminates

The LDAP directory is successfully entered into Confluence version 3.5.6. Confluence is restarted and initializes correctly with the LDAP\Active Directory. Confluence kicks off the automatic LDAP synchronization however logs the following error and terminates:

2011-06-14 17:09:01,890 ERROR QuartzScheduler_Worker-5 http://atlassian.crowd.directory.DbCachingDirectoryPoller pollChanges Error occurred while refreshing the cache for directory 11796481 .
com.atlassian.crowd.exception.OperationFailedException: org.springframework.ldap.CommunicationException: simple bind failed: xxxroot.home:636; nested exception is javax.naming.CommunicationException: simple bind failed: xxxroot.home:636 Root exception is java.net.SocketException: Connection reset
at com.atlassian.crowd.directory.SpringLDAPConnector.pageSearchResults(SpringLDAPConnector.java:352)
at com.atlassian.crowd.directory.SpringLDAPConnector.searchEntitiesWithRequestControls(SpringLDAPConnector.java:385)
at com.atlassian.crowd.directory.MicrosoftActiveDirectory.findTombstonesSince(MicrosoftActiveDirectory.java:368)
at com.atlassian.crowd.directory.MicrosoftActiveDirectory.findUserTombstonesSince(MicrosoftActiveDirectory.java:309)
at com.atlassian.crowd.directory.ldap.cache.UsnChangedCacheRefresher.synchroniseUserChanges(UsnChangedCacheRefresher.java:293)
at com.atlassian.crowd.directory.ldap.cache.UsnChangedCacheRefresher.synchroniseChanges(UsnChangedCacheRefresher.java:149)
at com.atlassian.crowd.directory.DbCachingRemoteDirectory.synchroniseCache(DbCachingRemoteDirectory.java:639)
at com.atlassian.crowd.manager.directory.DirectorySynchroniserImpl.synchronise(DirectorySynchroniserImpl.java:63)
at com.atlassian.crowd.directory.DbCachingDirectoryPoller.pollChanges(DbCachingDirectoryPoller.java:50)
at com.atlassian.crowd.manager.directory.monitor.poller.DirectoryPollerJobBean.executeInternal(DirectoryPollerJobBean.java:29)
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)
at org.quartz.core.JobRunShell.run(JobRunShell.java:199)
at com.atlassian.confluence.schedule.quartz.ConfluenceQuartzThreadPool$1.run(ConfluenceQuartzThreadPool.java:14)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)
Caused by: org.springframework.ldap.CommunicationException: simple bind failed: xxxroot.home:636; nested exception is javax.naming.CommunicationException: simple bind failed: xxxroot.home:636 Root exception is java.net.SocketException: Connection reset
at org.springframework.ldap.support.LdapUtils.convertLdapException(LdapUtils.java:98)
at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:319)
at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:237)
at com.atlassian.crowd.directory.SpringLDAPConnector.pageSearchResults(SpringLDAPConnector.java:316)
... 13 more
Caused by: javax.naming.CommunicationException: simple bind failed: xxxroot.home:636 Root exception is java.net.SocketException: Connection reset
at com.sun.jndi.ldap.LdapReferralContext.<init>(LdapReferralContext.java:74)
at com.sun.jndi.ldap.LdapReferralException.getReferralContext(LdapReferralException.java:132)
at com.sun.jndi.ldap.LdapCtx.searchAux(LdapCtx.java:1838)
at com.sun.jndi.ldap.LdapCtx.c_search(LdapCtx.java:1749)
at com.sun.jndi.toolkit.ctx.ComponentDirContext.p_search(ComponentDirContext.java:368)
at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.search(PartialCompositeDirContext.java:338)
at javax.naming.directory.InitialDirContext.search(InitialDirContext.java:257)
at sun.reflect.GeneratedMethodAccessor349.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.ldap.transaction.compensating.manager.TransactionAwareDirContextInvocationHandler.invoke(TransactionAwareDirContextInvocationHandler.java:92)
at $Proxy673.search(Unknown Source)
at org.springframework.ldap.core.LdapTemplate$3.executeSearch(LdapTemplate.java:231)
at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:293)
... 15 more
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:168)
at com.sun.net.ssl.internal.ssl.InputRecord.readFully(InputRecord.java:293)
at com.sun.net.ssl.internal.ssl.InputRecord.read(InputRecord.java:331)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:798)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1138)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:632)
at com.sun.net.ssl.internal.ssl.AppOutputStream.write(AppOutputStream.java:59)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
at com.sun.jndi.ldap.Connection.writeRequest(Connection.java:396)
at com.sun.jndi.ldap.LdapClient.ldapBind(LdapClient.java:334)
at com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:192)
at com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2694)
at com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:293)
at com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(LdapCtxFactory.java:175)
at com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.java:134)
at com.sun.jndi.url.ldap.ldapURLContextFactory.getObjectInstance(ldapURLContextFactory.java:35)
at javax.naming.spi.NamingManager.getURLObject(NamingManager.java:584)
at javax.naming.spi.NamingManager.processURL(NamingManager.java:364)
at javax.naming.spi.NamingManager.processURLAddrs(NamingManager.java:344)
at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:316)
at com.sun.jndi.ldap.LdapReferralContext.<init>(LdapReferralContext.java:93)
... 28 more