I'm not able to share a addressbook. My workflow:

1. Creating a new user
2. Creating a new address book
3. Fill in some contacts
4. Share this address book to a group (view) by using the internal distribution list e-mail-address
5. Switching to another user (a member of the list above)
6. Recieving the announcement e-mail and clicking the "Accept Share" within the webinterface
7. Switching to the address book section and click on the new address book
8. The error occurred: "A network service error has accurred."

msg - system failure: IOException
com.zimbra.cs.service.ServiceException: system failure: IOException
at com.zimbra.cs.service.ServiceException.FAILURE(Ser viceException.java:174)
at com.zimbra.cs.index.ProxiedQueryResults.bufferNext Hits(ProxiedQueryResults.java:353)
at com.zimbra.cs.index.ProxiedQueryResults.peekNext(P roxiedQueryResults.java:207)
at com.zimbra.cs.index.RemoteQueryOperation.peekNext( RemoteQueryOperation.java:160)
at com.zimbra.cs.index.QueryOperation.hasNext(QueryOp eration.java:184)
at com.zimbra.cs.index.ItemPreloadingGrouper.bufferHi ts(ItemPreloadingGrouper.java:61)
at com.zimbra.cs.index.BufferingResultsGrouper.peekNe xt(BufferingResultsGrouper.java:83)
at com.zimbra.cs.index.UngroupedQueryResults.peekNext (UngroupedQueryResults.java:62)
at com.zimbra.cs.index.ZimbraQueryResultsImpl.hasNext (ZimbraQueryResultsImpl.java:69)
at com.zimbra.cs.index.HitIdGrouper.bufferHits(HitIdG rouper.java:67)
at com.zimbra.cs.index.BufferingResultsGrouper.getNex t(BufferingResultsGrouper.java:103)
at com.zimbra.cs.index.ResultsPager.forward(ResultsPa ger.java:182)
at com.zimbra.cs.index.ResultsPager.<init>(ResultsPag er.java:118)
at com.zimbra.cs.index.ResultsPager.create(ResultsPag er.java:65)
at com.zimbra.cs.service.mail.Search.handle(Search.ja va:84)
at com.zimbra.soap.SoapEngine.dispatchRequest(SoapEng ine.java:261)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:162)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:84)
at com.zimbra.soap.SoapServlet.doPost(SoapServlet.jav a:223)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:709)
at com.zimbra.cs.servlet.ZimbraServlet.service(Zimbra Servlet.java:173)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:802)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve.java:107)
at org.apache.catalina.valves.AccessLogValve.invoke(A ccessLogValve.java:541)
at org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11 ConnectionHandler.processConnection(Http11BaseProt ocol.java:667)
at org.apache.tomcat.util.net.PoolTcpEndpoint.process Socket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThr ead.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
Caused by: javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: Untrusted Server Certificate Chain
at com.sun.net.ssl.internal.ssl.Alerts.getSSLExceptio n(Alerts.java:150)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(S SLSocketImpl.java:1518)
at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Ha ndshaker.java:174)
at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Ha ndshaker.java:168)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.serv erCertificate(ClientHandshaker.java:848)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.proc essMessage(ClientHandshaker.java:106)
at com.sun.net.ssl.internal.ssl.Handshaker.processLoo p(Handshaker.java:495)
at com.sun.net.ssl.internal.ssl.Handshaker.process_re cord(Handshaker.java:433)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRec ord(SSLSocketImpl.java:818)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.perform InitialHandshake(SSLSocketImpl.java:1030)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRe cord(SSLSocketImpl.java:622)
at com.sun.net.ssl.internal.ssl.AppOutputStream.write (AppOutputStream.java:59)
at java.io.BufferedOutputStream.flushBuffer(BufferedO utputStream.java:65)
at java.io.BufferedOutputStream.flush(BufferedOutputS tream.java:123)
at org.apache.commons.httpclient.methods.StringReques tEntity.writeRequest(StringRequestEntity.java:150)
at org.apache.commons.httpclient.methods.EntityEnclos ingMethod.writeRequestBody(EntityEnclosingMethod.j ava:495)
at org.apache.commons.httpclient.HttpMethodBase.write Request(HttpMethodBase.java:1973)
at org.apache.commons.httpclient.HttpMethodBase.execu te(HttpMethodBase.java:993)
at org.apache.commons.httpclient.HttpMethodDirector.e xecuteWithRetry(HttpMethodDirector.java:397)
at org.apache.commons.httpclient.HttpMethodDirector.e xecuteMethod(HttpMethodDirector.java:170)
at org.apache.commons.httpclient.HttpClient.executeMe thod(HttpClient.java:396)
at org.apache.commons.httpclient.HttpClient.executeMe thod(HttpClient.java:324)
at com.zimbra.soap.SoapHttpTransport.invoke(SoapHttpT ransport.java:192)
at com.zimbra.soap.SoapTransport.invokeWithoutSession (SoapTransport.java:251)
at com.zimbra.cs.index.ProxiedQueryResults.bufferNext Hits(ProxiedQueryResults.java:306)
... 35 more
Caused by: java.security.cert.CertificateException: Untrusted Server Certificate Chain
at com.sun.net.ssl.X509TrustManagerJavaxWrapper.check ServerTrusted(SSLSecurity.java:600)
at com.sun.net.ssl.internal.ssl.JsseX509TrustManager. checkServerTrusted(SSLContextImpl.java:320)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.serv erCertificate(ClientHandshaker.java:841)
... 55 more

code - service.FAILURE
method - ZmCsfeCommand.prototype.invoke
detail - soap:Receiver
line - 55149
sourceURL - http://net-death.de/zimbra/js/Zimbra...v=061016143950
I'm using the newest ZCS version 4.0.3 Networkedition.

What is wrong? Can anybody help me out?