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我的FineReport模板设计器今天突然连不上服务器了，请专业人士帮忙解决。。
显示错误堆栈：
com.fr.workspace.engine.exception.RemoteDesignNetworkConfigException: com.fr.workspace.engine.exception.WorkspaceNoResponseException: Server workspace no response.
at com.fr.workspace.engine.convert.NetworkConnectionErrorConverter.convert(NetworkConnectionErrorConverter.java)
at com.fr.workspace.engine.convert.NetworkConnectionErrorConverter.convert(NetworkConnectionErrorConverter.java)
at com.fr.workspace.engine.convert.ExceptionConverter.convert(ExceptionConverter.java)
at com.fr.env.handler.impl.UnexpectedHandler.handle(UnexpectedHandler.java:22)
at com.fr.env.handler.impl.UnexpectedHandler.handle(UnexpectedHandler.java:16)
at com.fr.env.handler.WorkspaceExceptionHandler.handle(WorkspaceExceptionHandler.java:58)
at com.fr.env.handler.WorkspaceExceptionHandler.handleInStart(WorkspaceExceptionHandler.java:90)
at com.fr.design.EnvChangeEntrance.dealEvnExceptionWhenStartDesigner(EnvChangeEntrance.java:496)
at com.fr.start.module.DesignerWorkspaceProvider.start(DesignerWorkspaceProvider.java:60)
at com.fr.module.engine.strategy.ParentFirstStrategy.doStart(ParentFirstStrategy.java)
at com.fr.module.engine.strategy.AbstractInvokeSubStrategy.start(AbstractInvokeSubStrategy.java)
at com.fr.module.engine.FineModule$FineModuleRunner.executeStart(FineModule.java)
at com.fr.stable.lifecycle.AbstractLifecycle.start(AbstractLifecycle.java)
at com.fr.module.engine.FineModule$FineModuleRunner.start(FineModule.java)
at com.fr.module.engine.FineModule.start(FineModule.java)
at com.fr.module.engine.strategy.AbstractInvokeSubStrategy.startSub(AbstractInvokeSubStrategy.java)
at com.fr.module.engine.strategy.SubFirstStrategy.doStart(SubFirstStrategy.java)
at com.fr.module.engine.strategy.AbstractInvokeSubStrategy.start(AbstractInvokeSubStrategy.java)
at com.fr.module.engine.FineModule$FineModuleRunner.executeStart(FineModule.java)
at com.fr.stable.lifecycle.AbstractLifecycle.start(AbstractLifecycle.java)
at com.fr.module.engine.FineModule$FineModuleRunner.start(FineModule.java)
at com.fr.module.engine.FineModule.start(FineModule.java)
at com.fr.start.util.DesignerStartupPageUtil.enterWorkspace(DesignerStartupPageUtil.java:18)
at com.fr.start.module.optimized.DesignerStartupPageActivator.launchAfterWarmup(DesignerStartupPageActivator.java:162)
at com.fr.start.module.optimized.DesignerStartupPageActivator.lambda$null$2(DesignerStartupPageActivator.java:106)
at com.fr.startup.ui.StartupPageWindow$4.doInBackground(StartupPageWindow.java:246)
at com.fr.startup.ui.StartupPageWindow$4.doInBackground(StartupPageWindow.java:243)
at javax.swing.SwingWorker$1.call(SwingWorker.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at javax.swing.SwingWorker.run(SwingWorker.java:334)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: com.fr.workspace.engine.exception.WorkspaceNoResponseException: Server workspace no response.
at com.fr.workspace.engine.rpc.WorkspaceInvoker.invoke(WorkspaceInvoker.java)
at com.fr.workspace.engine.rpc.WorkspaceProxyPool$1.invoke(WorkspaceProxyPool.java)
at com.sun.proxy.$Proxy35.getInterval(Unknown Source)
at com.fr.workspace.engine.client.FineWorkspaceClient.startHeartBeat(FineWorkspaceClient.java)
at com.fr.workspace.engine.client.FineWorkspaceClient.<init>(FineWorkspaceClient.java)
at com.fr.workspace.engine.client.FineWorkspaceConnector.connect(FineWorkspaceConnector.java)
at com.fr.design.env.DesignerWorkspaceGenerator$1.call(DesignerWorkspaceGenerator.java:53)
at com.fr.design.env.DesignerWorkspaceGenerator$1.call(DesignerWorkspaceGenerator.java:50)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
... 3 more | 
