Crowd sync error with JIRA

[Neeta Dubey]

We have JIRA 5.1.6 and we have a plan to upgrade it on soon however my crowd instance is unable to sync with JIRA and give below error. Could you please advise? I referred the doc which is not very helpful as I'v hard time in understanding the resolution steps.

https://confluence.atlassian.com/display/STASHKB/Synchronization+with+LDAP+Server+Fails+with+PartialResultException

2015-06-29 01:13:41,835 scheduler_Worker-1 INFO [atlassian.crowd.directory.DbCachingRemoteDirectory] failed synchronisation complete in [ 2621070ms ]
2015-06-29 01:13:41,835 scheduler_Worker-1 ERROR [atlassian.crowd.directory.DbCachingDirectoryPoller] Error occurred while refreshing the cache for directory [ 32772 ].
com.atlassian.crowd.model.group.Membership$MembershipIterationException: com.atlassian.crowd.exception.OperationFailedException: org.springframework.ldap.PartialResultException: nested exception is javax.naming.PartialResultException [Root exception is javax.naming.CommunicationException: zs.local:389 [Root exception is java.net.SocketTimeoutException: connect timed out]]
at com.atlassian.crowd.directory.DirectoryMembershipsIterable$1.apply(DirectoryMembershipsIterable.java:62)
at com.atlassian.crowd.directory.DirectoryMembershipsIterable$1.apply(DirectoryMembershipsIterable.java:52)
at com.google.common.collect.Iterators$8.next(Iterators.java:697)

[Nic Brough -Adaptavist-]

Root exception is java.net.SocketTimeoutException: 

Means JIRA can't reach your Crowd server over the network.  There's not a lot of documentation we can give you - you need to fix your network setup or settings.

[Neeta Dubey]

Thanks Nic. Is there something in particular I should check with Network team to dig down this issue.

[Nic Brough -Adaptavist-]

Could be any one of a number of issues. The most likely one is simply that there is no route between the servers, but I can't really tell you how to diagnose that beyond trying standard network tools - ping, nslookup tracert, trying the ip address instead of server name, and even a raw telnet to the Crowd server/port to see if that responds. Also, check the Crowd logs to see if it is receiving anything at ll from your JIRA