Exception contacting Bugzilla server

I'm running into a slightly different Bugzilla import problem than the one reported in https://jazz.net/forums/viewtopic.php?t=1231, so I'm starting this new thread.

When using the Bugzilla import wizard (Team Concert M6), I supply my credentials and specify the "Use Cookies" radio button. When clicking 'Finish', I get an error dialog with the message, "Exception Contacting Bugzilla server". There are no additional details shown via the "Details>>" button. The stack trace below is associated with the error in the Eclipse error log:

com.ibm.team.workitem.rcp.core.internal.bugzilla.BugzillaException: Exception contacting Bugzilla server

	at com.ibm.team.workitem.rcp.core.internal.bugzilla.http.CookieLoginOperation.sendData(CookieLoginOperation.java:93)

	at com.ibm.team.workitem.rcp.core.internal.bugzilla.http.CookieLoginOperation.getCookie(CookieLoginOperation.java:44)

	at com.ibm.team.workitem.rcp.core.internal.bugzilla.BugzillaImporter.ensureIsLoggedIn(BugzillaImporter.java:354)

	at com.ibm.team.workitem.rcp.core.internal.bugzilla.BugzillaImporter.runImport(BugzillaImporter.java:158)

	at com.ibm.team.workitem.rcp.core.internal.bugzilla.BugzillaImporter.access$0(BugzillaImporter.java:113)

	at com.ibm.team.workitem.rcp.core.internal.bugzilla.BugzillaImporter$1.run(BugzillaImporter.java:108)

	at com.ibm.team.workitem.common.internal.util.Utils.runImport(Utils.java:435)

	at com.ibm.team.workitem.rcp.core.internal.bugzilla.BugzillaImporter.doImport(BugzillaImporter.java:106)

	at com.ibm.team.workitem.rcp.ui.internal.wizards.bugzilla.BugzillaImportWizard$1.run(BugzillaImportWizard.java:137)

	at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:113)

com.ibm.team.workitem.rcp.core.internal.bugzilla.BugzillaException[0]: javax.net.ssl.SSLHandshakeException: com.ibm.jsse2.util.h: PKIX path building failed: java.security.cert.CertPathBuilderException: unable to find valid certification path to requested target

<snipped>

I'm not an SSL/cookie expert. Could the problem be that my Bugzilla server uses a self-signed certificate?

Thanks, ...Jim