Hi All,

I'm facing an error while migrating a single mailbox from one server to another.

Error in source server:

Code:
[zimbra@system4 ~]$ zmmboxmove -a system4@system4.example.com --from system4.example.com --to system3.example.com
Error occurred: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Error in target server:

Code:
2013-01-02 17:11:44,082 WARN  [btpool0-1] [] log - 192.168.4.14:55279
javax.net.ssl.SSLException: Received fatal alert: certificate_unknown
        at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:190)
        at com.sun.net.ssl.internal.ssl.SSLEngineImpl.fatal(SSLEngineImpl.java:1467)
        at com.sun.net.ssl.internal.ssl.SSLEngineImpl.fatal(SSLEngineImpl.java:1435)
        at com.sun.net.ssl.internal.ssl.SSLEngineImpl.recvAlert(SSLEngineImpl.java:1601)
        at com.sun.net.ssl.internal.ssl.SSLEngineImpl.readRecord(SSLEngineImpl.java:1031)
        at com.sun.net.ssl.internal.ssl.SSLEngineImpl.readNetRecord(SSLEngineImpl.java:845)
        at com.sun.net.ssl.internal.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:721)
        at javax.net.ssl.SSLEngine.unwrap(SSLEngine.java:607)
        at org.mortbay.jetty.security.SslHttpChannelEndPoint.unwrap(SslHttpChannelEndPoint.java:512)
        at org.mortbay.jetty.security.SslHttpChannelEndPoint.fill(SslHttpChannelEndPoint.java:357)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:290)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:415)
        at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:429)
        at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:451)
Not sure what is wrong here. I'm using Zimbra NE 7.2.1 version and it is a LAB environment.

Any help would be really appriciated.

Thanks,