gerrit-3.1.5+nginx（jdk1.8.0_11），但是在填写：New email address时提示：Error 500 (Server Error): Internal server error
Endpoint: /account/self/emails/*；
然后在Gerrit中的error_log中有关于
Error：[HTTP PUT /accounts/self/emails/123%40163.com (from 192.168.2.22)] ERROR com.google.gerrit.httpd.restapi.RestApiServlet : Error in PUT /accounts/self/emails/123%40163.com
com.google.gerrit.exceptions.EmailException: Mail Error: Connection refused
at com.google.gerrit.server.mail.send.SmtpEmailSender.open(SmtpEmailSender.java:438)
at com.google.gerrit.server.mail.send.SmtpEmailSender.send(SmtpEmailSender.java:207)
at com.google.gerrit.server.mail.send.OutgoingEmail.send(OutgoingEmail.java:210)
at com.google.gerrit.server.restapi.account.CreateEmail.apply(CreateEmail.java:142)
at com.google.gerrit.server.restapi.account.CreateEmail.apply(CreateEmail.java:100)
at com.google.gerrit.server.restapi.account.CreateEmail.apply(CreateEmail.java:50)
at com.google.gerrit.httpd.restapi.RestApiServlet.service(RestApiServlet.java:520)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:290)
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:280)
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:184)
at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:89)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85)
at com.google.gerrit.httpd.raw.StaticModule$PolyGerritFilter.doFilter(StaticModule.java:436)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.gerrit.httpd.GetUserFilter.doFilter(GetUserFilter.java:92)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.gerrit.httpd.RunAsFilter.doFilter(RunAsFilter.java:120)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.gerrit.httpd.SetThreadNameFilter.doFilter(SetThreadNameFilter.java:62)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.gerrit.httpd.AllRequestFilter$FilterProxy$1.doFilter(AllRequestFilter.java:133)
at com.google.gerrit.httpd.AllRequestFilter$FilterProxy.doFilter(AllRequestFilter.java:135)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.gerrit.httpd.RequestCleanupFilter.doFilter(RequestCleanupFilter.java:60)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.gerrit.httpd.RequestMetricsFilter.doFilter(RequestMetricsFilter.java:57)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.gerrit.httpd.RequestContextFilter.doFilter(RequestContextFilter.java:64)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:121)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:133)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:545)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1610)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1300)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1580)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1215)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:54)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.Server.handle(Server.java:500)
at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383)
at org.eclipse.jetty.server.HttpChannel$$Lambda$443/465818618.dispatch(Unknown Source)
at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:273)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:135)
at org.eclipse.jetty.io.ManagedSelector$$Lambda$436/1478800517.run(Unknown Source)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:649)
at org.apache.commons.net.SocketClient._connect(SocketClient.java:243)
at org.apache.commons.net.SocketClient.connect(SocketClient.java:202)
at com.google.gerrit.server.mail.send.SmtpEmailSender.open(SmtpEmailSender.java:403)
... 62 more
还望大家帮忙解答，已困扰好久！
其中gerrit_config配置如下：
