Just set up Zimbra and it works fine so far, but inspecting mailbox.log shows that a few Java SOAP errors occurred. Sadly, I do not have the knowledge nor experience to understand what is wrong.

Here is a part of my mailbox.log file:
Code:
2011-09-03 14:36:40,489 INFO  [btpool0-31://192.168.77.87:7071/service/admin/soap/BatchRequest] [name=admin@andreansky.eu;mid=1;ip=192.168.77.28;ua=ZimbraWebClient - SAF3 (Linux);] SoapEngine - handler exception
com.zimbra.common.service.ServiceException: system failure: exception during auth {RemoteManager: ns.andreansky.eu->zimbra@ns.andreansky.eu:22}
ExceptionId:btpool0-31://192.168.77.87:7071/service/admin/soap/BatchRequest:1315053400489:093f3f7492a042ac
Code:service.FAILURE
	at com.zimbra.common.service.ServiceException.FAILURE(ServiceException.java:248)
	at com.zimbra.cs.rmgmt.RemoteManager.getSession(RemoteManager.java:193)
	at com.zimbra.cs.rmgmt.RemoteManager.execute(RemoteManager.java:127)
	at com.zimbra.cs.service.admin.GetServerNIFs.handle(GetServerNIFs.java:65)
	at com.zimbra.soap.SoapEngine.dispatchRequest(SoapEngine.java:412)
	at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.java:273)
	at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.java:158)
	at com.zimbra.soap.SoapServlet.doWork(SoapServlet.java:294)
	at com.zimbra.soap.SoapServlet.doPost(SoapServlet.java:215)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
	at com.zimbra.cs.servlet.ZimbraServlet.service(ZimbraServlet.java:208)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:814)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
	at com.zimbra.cs.servlet.SetHeaderFilter.doFilter(SetHeaderFilter.java:79)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
	at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81)
	at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:132)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:218)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:422)
	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
	at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.handler.rewrite.RewriteHandler.handle(RewriteHandler.java:230)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.handler.DebugHandler.handle(DebugHandler.java:77)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:326)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:543)
	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:946)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:405)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
	at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:451)
Caused by: java.io.IOException: There was a problem while connecting to ns.andreansky.eu:22
	at ch.ethz.ssh2.Connection.connect(Connection.java:699)
	at ch.ethz.ssh2.Connection.connect(Connection.java:490)
	at com.zimbra.cs.rmgmt.RemoteManager.getSession(RemoteManager.java:184)
	... 37 more
Caused by: java.net.ConnectException: Connection refused
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
	at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
	at java.net.Socket.connect(Socket.java:529)
	at ch.ethz.ssh2.transport.TransportManager.establishConnection(TransportManager.java:340)
	at ch.ethz.ssh2.transport.TransportManager.initialize(TransportManager.java:448)
	at ch.ethz.ssh2.Connection.connect(Connection.java:643)
	... 39 more
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