After configured Funambol and tried sync Zimbra i've received this messages in ds-server.log.

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.securi
ty.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at com.sun.net.ssl.internal.ssl.Alerts.getSSLExceptio n(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(U nknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Un known Source)
at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Un known Source)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.serv erCertificate(Unknown Source)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.proc essMessage(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.processLoo p(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.process_re cord(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRec ord(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.perform InitialHandshake(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHa ndshake(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHa ndshake(Unknown Source)
at sun.net.http://www.protocol.https.HttpsClien...onnect(Unknown Source)
at sun.net.http://www.protocol.https.AbstractDe...onnect(Unknown Source)
at sun.net.http://www.protocol.http.HttpURLConn...Stream(Unknown Source)
at sun.net.http://www.protocol.https.HttpsURLCo...Stream(Unknown Source)
at ru.korusconsulting.connector.base.ZimbraPort.sendR equest(ZimbraPort.java:624)
at ru.korusconsulting.connector.base.ZimbraPort.reque stAutorization(ZimbraPort.java:140)
at ru.korusconsulting.connector.funambol.ZimbraSyncSo urce.commonSync(ZimbraSyncSource.java:121)
at ru.korusconsulting.connector.funambol.ZimbraSyncSo urce.beginSync(ZimbraSyncSource.java:102)
at ru.korusconsulting.connector.funambol.ContactSyncS ource.beginSync(ContactSyncSource.java:40)
at com.funambol.server.engine.Sync4jEngine.sync(Sync4 jEngine.java:610)
at com.funambol.server.session.SyncSessionHandler.pro cessModifications(SyncSessionHandler.java:1655)
at com.funambol.server.session.SyncSessionHandler.pro cessSyncMessage(SyncSessionHandler.java:1499)
at com.funambol.server.session.SyncSessionHandler.pro cessInitSyncMapMessage(SyncSessionHandler.java:960 )
at com.funambol.server.session.SyncSessionHandler.pro cessMessage(SyncSessionHandler.java:527)
at com.funambol.server.engine.SyncAdapter.processInpu tMessage(SyncAdapter.java:491)
at com.funambol.server.engine.SyncAdapter.processMess age(SyncAdapter.java:442)
at com.funambol.server.engine.SyncAdapter.processXMLM essage(SyncAdapter.java:218)
at com.funambol.transport.http.server.LocalSyncHolder .processXMLMessage(LocalSyncHolder.java:97)
at com.funambol.transport.http.server.Sync4jServlet.d oPost(Sync4jServlet.java:400)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:803)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilt