this error in zmmailboxd.out file:
checking the zmmailboxd.out log in zimbra mailbox server I can see this error:
2016-06-01 12:51:45.643:WARN:oejs.ServletHandler:qtp509886383-131:
http://xx.xx.xx.xx:8080/service/proxy?t ... 4778335063: /service/proxy
java.net.MalformedURLException: no protocol: null/middleware_lib.js
at java.net.URL.<init>(URL.java:586)
at java.net.URL.<init>(URL.java:483)
at java.net.URL.<init>(URL.java:432)
at com.zimbra.cs.zimlet.ProxyServlet.doProxy(ProxyServlet.java:230)
at com.zimbra.cs.zimlet.ProxyServlet.doGet(ProxyServlet.java:161)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at com.zimbra.cs.servlet.ZimbraServlet.service(ZimbraServlet.java:206)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:738)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1651)
at com.zimbra.cs.servlet.RequestStringFilter.doFilter(RequestStringFilter.java:54)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1622)
at com.zimbra.cs.servlet.SetHeaderFilter.doFilter(SetHeaderFilter.java:59)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1622)
at org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:83)
at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:351)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1622)
at com.zimbra.cs.servlet.ETagHeaderFilter.doFilter(ETagHeaderFilter.java:47)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1622)
at com.zimbra.cs.servlet.ContextPathBasedThreadPoolBalancerFilter.doFilter(ContextPathBasedThreadPoolBalancerFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1622)
at com.zimbra.cs.servlet.ZimbraQoSFilter.doFilter(ZimbraQoSFilter.java:116)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1622)
at com.zimbra.cs.servlet.ZimbraInvalidLoginFilter.doFilter(ZimbraInvalidLoginFilter.java:117)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1622)
at org.eclipse.jetty.servlets.DoSFilter.doFilterChain(DoSFilter.java:457)
at org.eclipse.jetty.servlets.DoSFilter.doFilter(DoSFilter.java:326)
at org.eclipse.jetty.servlets.DoSFilter.doFilter(DoSFilter.java:299)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1622)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:549)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:544)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1111)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:478)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1045)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:199)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:309)
at org.eclipse.jetty.server.handler.DebugHandler.handle(DebugHandler.java:81)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:462)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:279)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:232)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:534)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)
at java.lang.Thread.run(Thread.java:745)
ERROR [Zimbra Talk for Zimbra] 2016-06-01 12:51:46.825 request_storeConfiguration java.lang.NumberFormatException: null