communication error during CC/RTC sync

When trying to import 1GB of data from ClearCase to RTC, sync failed after 167 minutes. It seems to be a connection issue. Any comment on how to avoid such errors? Thanks.

Creating file: TE584-A238 Linking Requirement to Business Process TCER.xls.xls
Synchronization exception: Could not find an item with the clone value: com.ibm.team.links.internal.links.impl.ReferenceImpl@723c723c (internalId: <unset>) (uri: oid%3Aed8aee8a.21154b51.90ea.73%3A39%3A32%3A75%3A8f%3Aea%40vobuuid%3Ade0a79f2.1a8646f6.97bd.d7%3Ab6%3A91%3A05%3Acb%3Ac2, referenceType: URI_REFERENCE, comment: , referenceSide: <unset>, extraInfo: null)

Caused by: CRJAZ1037I Failing query ->

AuditableLinkQueryModel r = AuditableLinkQueryModel.ROOT;
AstQuery q = (AstQuery) IItemQuery.FACTORY.newInstance(r);
q.distinct();
q.filter(r.name()._eq(q.newStringArg())._and(r.targetRef().uri()._in(new IString[] {q.newStringArg()})));

Caused by: CRJAZ0368I Error executing query
stmt = select distinct t1.ITEM_ID, t1.STATE_ID from LINKS.AUDITABLE_LINK t1 where ((t1.NAME_COL = ?) and t1.TARGET_REF_URI in(?))

Caused by: A communication error has been detected. Communication protocol being used: TCP/IP.
Communication API being used: SOCKETS. Location where the error was detected: T4Agent.sendRequest().
Communication function detecting the error: OutputStream.flush(). Protocol specific error codes Connection reset by peer: socket write error, *, 0. Message: Connection reset by peer: socket write error

BUILD FAILED
E:\Program Files\IBM\JazzGDE\ClearCaseConnector\ccctools\ScmConnectors\synchronizeStream.xml:59: javax.wvcm.WvcmException: Synchronization failed.

Total time: 167 minutes 31 seconds
Build failed. Exit value was 1.