Error while importing users in LDAP for SDP 8.0

Hi,
I have more than 4000 users when LDAP import to the SPD fails time out does not import although still connect to the LDAP

javax.naming.CommunicationException: connection closed [Root exception is java.io.IOException: connection closed]; remaining name 'ou=People,dc=tht,dc=com'

[16:18:33:218]|[10-05-2012]|[SYSOUT]|[INFO]|[24]|: here inside Login.jsp---->|
[16:18:33:218]|[10-05-2012]|[com.adventnet.servicedesk.authentication.NTLMV2Filter]|[INFO]|[24]|: generateNTLMV2Script HttpServletRequest--->http://localhost/ErrorLogListView.do|
[16:18:33:218]|[10-05-2012]|[com.adventnet.servicedesk.authentication.NTLMV2Filter]|[INFO]|[24]|: lurl--->ErrorLogListView.do|
[16:18:33:218]|[10-05-2012]|[com.adventnet.servicedesk.setup.util.SSOUtil]|[INFO]|[24]|: User Or Domain Is Empty inside SSOUtil|
[16:18:33:218]|[10-05-2012]|[com.adventnet.servicedesk.setup.util.LDAPUtil]|[INFO]|[24]|: IsLDAPAuthentication Result : true|
[16:18:39:161]|[10-05-2012]|[SYSOUT]|[INFO]|[25]|: SELECT AaaLogin.LOGIN_ID,AaaLogin.USER_ID,AaaLogin.NAME,AaaLogin.DOMAINNAME FROM AaaLogin WHERE (AaaLogin.NAME = N'administrator' COLLATE SQL_Latin1_General_CP1_CI_AS) ORDER BY 4|
[16:18:39:966]|[10-05-2012]|[com.adventnet.authentication.internal.WebClientAuthenticationManager]|[INFO]|[24]|: authenticating user : administrator|
[16:18:39:966]|[10-05-2012]|[com.adventnet.servicedesk.authentication.internal.LDAPLoginModule]|[INFO]|[24]|: received data >>> LoginName:administrator domain:nullisLocalAuth--->true|
[16:18:39:966]|[10-05-2012]|[com.adventnet.authentication.internal.WebClientAuthenticationManager]|[INFO]|[26]|: authenticating user : administrator|
[16:18:39:966]|[10-05-2012]|[com.adventnet.servicedesk.setup.action.AdminErrorLogAction]|[INFO]|[26]|: forwardedFrom : null|
[16:18:40:299]|[10-05-2012]|[SYSOUT]|[INFO]|[26]|: [JBOSS] PropertyMessageResources: Initializing, config='org.apache.struts.taglib.html.LocalStrings', returnNull=true|
[16:18:42:817]|[10-05-2012]|[com.adventnet.servicedesk.setup.action.AdminErrorLogAction]|[INFO]|[27]|: forwardedFrom : null|
[16:18:45:137]|[10-05-2012]|[com.adventnet.servicedesk.setup.action.ErrorLogDetailsAction]|[INFO]|[26]|: Error log details : <WritableDataObject>
<Tables>
[AaaUser, ErrorLog] </Tables>
SelectQuery Object:
    Select columnNames=[ErrorLog.ERRORLOGID, ErrorLog.OCCURREDTIME, ErrorLog.MESSAGE, ErrorLog.ERRORMODULE, ErrorLog.SUBERRORMODULE, ErrorLog.PROBABLECAUSE, ErrorLog.OWNERID, ErrorLog.TYPE, ErrorLog.ACTION, AaaUser.USER_ID, AaaUser.FIRST_NAME]
    Criteria=(ErrorLog.ERRORLOGID = '3002')
    Number of Objects=0
    Starting row=1
    Order by columnNames=[]
    Table List=[ErrorLog AS ErrorLog, AaaUser AS AaaUser]
    Joins= Join := ErrorLog AS ErrorLog LEFT JOIN AaaUser AS AaaUser ON ErrorLog.OWNERID=AaaUser.USER_ID
    SetLock= false
<JoinsInDO>
Join := ErrorLog AS ErrorLog LEFT JOIN AaaUser AS AaaUser ON ErrorLog.OWNERID=AaaUser.USER_ID
</JoinsInDO>
<Operations>
</Operations>
<Rows>
<AaaUser USER_ID="4" FIRST_NAME="administrator" MIDDLE_NAME="null" LAST_NAME="null" CREATEDTIME="null" DESCRIPTION="null" />
<ErrorLog ERRORLOGID="3002" OCCURREDTIME="1349427809446" MESSAGE="Error while importing users in LDAP" ERRORMODULE="Admin" SUBERRORMODULE="LDAP" PROBABLECAUSE="javax.naming.CommunicationException: connection closed [Root exception is java.io.IOException: connection closed]; remaining name 'ou=People,dc=tht,dc=com'" OWNERID="4" TYPE="Error" ACTION="" />

pls help me