i got this error below and not sure how to solve it
com.atlassian.crowd.exception.OperationFailedException: Error looking up attributes for highestCommittedUSN
at com.atlassian.crowd.directory.MicrosoftActiveDirectory.fetchHighestCommittedUSN(MicrosoftActiveDirectory.java:809)
at com.atlassian.crowd.directory.ldap.cache.UsnChangedCacheRefresher.synchroniseAll(UsnChangedCacheRefresher.java:166)
at com.atlassian.crowd.directory.DbCachingRemoteDirectory.synchroniseCache(DbCachingRemoteDirectory.java:1122)
at com.atlassian.crowd.manager.directory.DirectorySynchroniserImpl.synchronise(DirectorySynchroniserImpl.java:76)
at com.atlassian.jira.crowd.embedded.JiraDirectorySynchroniser.synchronizeDirectory(JiraDirectorySynchroniser.java:77)
at com.atlassian.jira.crowd.embedded.JiraDirectorySynchroniser.runJob(JiraDirectorySynchroniser.java:52)
at com.atlassian.scheduler.core.JobLauncher.runJob(JobLauncher.java:153)
at com.atlassian.scheduler.core.JobLauncher.launchAndBuildResponse(JobLauncher.java:118)
at com.atlassian.scheduler.core.JobLauncher.launch(JobLauncher.java:97)
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.launchJob(CaesiumSchedulerService.java:401)
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.executeClusteredJob(CaesiumSchedulerService.java:396)
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.executeQueuedJob(CaesiumSchedulerService.java:349)
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService$1.consume(CaesiumSchedulerService.java:255)
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService$1.consume(CaesiumSchedulerService.java:252)
at com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeJob(SchedulerQueueWorker.java:65)
at com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeNextJob(SchedulerQueueWorker.java:59)
at com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.run(SchedulerQueueWorker.java:34)
at java.lang.Thread.run(Unknown Source)
Caused by: org.springframework.ldap.CommunicationException: EIAST-DCGC01:389; nested exception is javax.naming.CommunicationException: EIAST-DCGC01:389 [Root exception is java.net.ConnectException: Connection refused: connect]
at org.springframework.ldap.support.LdapUtils.convertLdapException(LdapUtils.java:108)
at org.springframework.ldap.core.support.AbstractContextSource.createContext(AbstractContextSource.java:356)
at org.springframework.ldap.core.support.AbstractContextSource.doGetContext(AbstractContextSource.java:140)
at org.springframework.ldap.core.support.AbstractContextSource.getReadWriteContext(AbstractContextSource.java:175)
at org.springframework.ldap.transaction.compensating.manager.TransactionAwareContextSourceProxy.getReadWriteContext(TransactionAwareContextSourceProxy.java:88)
at org.springframework.ldap.core.LdapTemplate.executeReadOnly(LdapTemplate.java:802)
at org.springframework.ldap.core.LdapTemplate.lookup(LdapTemplate.java:832)
at com.atlassian.crowd.directory.ldap.SpringLdapTemplateWrapper$3.timedCall(SpringLdapTemplateWrapper.java:181)
at com.atlassian.crowd.directory.ldap.SpringLdapTemplateWrapper$TimedCallable.call(SpringLdapTemplateWrapper.java:126)
at com.atlassian.crowd.directory.ldap.SpringLdapTemplateWrapper.invokeWithContextClassLoader(SpringLdapTemplateWrapper.java:89)
at com.atlassian.crowd.directory.ldap.SpringLdapTemplateWrapper.lookup(SpringLdapTemplateWrapper.java:178)
at com.atlassian.crowd.directory.MicrosoftActiveDirectory.fetchHighestCommittedUSN(MicrosoftActiveDirectory.java:785)
... 17 more
Caused by: javax.naming.CommunicationException: EIAST-DCGC01:389 [Root exception is java.net.ConnectException: Connection refused: connect]
at com.sun.jndi.ldap.Connection.<init>(Unknown Source)
at com.sun.jndi.ldap.LdapClient.<init>(Unknown Source)
at com.sun.jndi.ldap.LdapClientFactory.createPooledConnection(Unknown Source)
at com.sun.jndi.ldap.pool.Connections.<init>(Unknown Source)
at com.sun.jndi.ldap.pool.Pool.getPooledConnection(Unknown Source)
at com.sun.jndi.ldap.LdapClient.getInstance(Unknown Source)
at com.sun.jndi.ldap.LdapCtx.connect(Unknown Source)
at com.sun.jndi.ldap.LdapCtx.<init>(Unknown Source)
at com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(Unknown Source)
at com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(Unknown Source)
at com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(Unknown Source)
at com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(Unknown Source)
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.init(Unknown Source)
at javax.naming.ldap.InitialLdapContext.<init>(Unknown Source)
at org.springframework.ldap.core.support.LdapContextSource.getDirContextInstance(LdapContextSource.java:42)
at org.springframework.ldap.core.support.AbstractContextSource.createContext(AbstractContextSource.java:344)
... 28 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
... 3 filtered
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.jndi.ldap.Connection.createSocket(Unknown Source)
... 47 more