我正在尝试设置Jmeter插件管理器，只要打开插件管理器，就会发生以下错误。这是从公司网络尝试的，因此尝试与代理+身份验证一起调用Jmeter仍然无效。
Jmeter版本：5.1.1 插件管理器版本：1.3
错误日志如下
java.net.ConnectException: Connection refused: no further information
at sun.nio.ch.Net.pollConnect(Native Method) ~[?:?]
at sun.nio.ch.Net.pollConnectNow(Net.java:579) ~[?:?]
at sun.nio.ch.NioSocketImpl.timedFinishConnect(NioSocketImpl.java:549) ~[?:?]
at sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:597) ~[?:?]
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:339) ~[?:?]
at java.net.Socket.connect(Socket.java:585) ~[?:?]
at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:121) ~[httpclient-4.5.7.jar:4.5.7]
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180) ~[httpclient-4.5.7.jar:4.5.7]
at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:326) ~[httpclient-4.5.7.jar:4.5.7]
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:605) ~[httpclient-4.5.7.jar:4.5.7]
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:440) ~[httpclient-4.5.7.jar:4.5.7]
at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835) ~[httpclient-4.5.7.jar:4.5.7]
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83) ~[httpclient-4.5.7.jar:4.5.7]
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56) ~[httpclient-4.5.7.jar:4.5.7]
at org.jmeterplugins.repository.JARSourceHTTP.execute(JARSourceHTTP.java:499) ~[jmeter-plugins-manager-1.3.jar:?]
at org.jmeterplugins.repository.JARSourceHTTP.execute(JARSourceHTTP.java:494) ~[jmeter-plugins-manager-1.3.jar:?]
at org.jmeterplugins.repository.JARSourceHTTP.getJSON(JARSourceHTTP.java:152) ~[jmeter-plugins-manager-1.3.jar:?]
at org.jmeterplugins.repository.JARSourceHTTP.getRepositories(JARSourceHTTP.java:276) ~[jmeter-plugins-manager-1.3.jar:?]
at org.jmeterplugins.repository.JARSourceHTTP.getRepo(JARSourceHTTP.java:304) ~[jmeter-plugins-manager-1.3.jar:?]
at org.jmeterplugins.repository.PluginManager.load(PluginManager.java:71) ~[jmeter-plugins-manager-1.3.jar:?]
at org.jmeterplugins.repository.PluginManagerDialog.loadPlugins(PluginManagerDialog.java:140) [jmeter-plugins-manager-1.3.jar:?]
at org.jmeterplugins.repository.PluginManagerDialog.componentShown(PluginManagerDialog.java:260) [jmeter-plugins-manager-1.3.jar:?]
at java.awt.AWTEventMulticaster.componentShown(AWTEventMulticaster.java:187) [?:?]
at java.awt.Component.processComponentEvent(Component.java:6468) [?:?]
at java.awt.Component.processEvent(Component.java:6416) [?:?]
at java.awt.Container.processEvent(Container.java:2263) [?:?]
at java.awt.Window.processEvent(Window.java:2039) [?:?]
at java.awt.Component.dispatchEventImpl(Component.java:5012) [?:?]
at java.awt.Container.dispatchEventImpl(Container.java:2321) [?:?]
at java.awt.Window.dispatchEventImpl(Window.java:2762) [?:?]
at java.awt.Component.dispatchEvent(Component.java:4844) [?:?]
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772) [?:?]
at java.awt.EventQueue$4.run(EventQueue.java:721) [?:?]
at java.awt.EventQueue$4.run(EventQueue.java:715) [?:?]
at java.security.AccessController.doPrivileged(AccessController.java:391) [?:?]
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) [?:?]
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95) [?:?]
at java.awt.EventQueue$5.run(EventQueue.java:745) [?:?]
at java.awt.EventQueue$5.run(EventQueue.java:743) [?:?]
at java.security.AccessController.doPrivileged(AccessController.java:391) [?:?]
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) [?:?]
at java.awt.EventQueue.dispatchEvent(EventQueue.java:742) [?:?]
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) [?:?]
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) [?:?]
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:117) [?:?]
at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:190) [?:?]
at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:235) [?:?]
at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:233) [?:?]
at java.security.AccessController.doPrivileged(AccessController.java:312) [?:?]
at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:233) [?:?]
at java.awt.Dialog.show(Dialog.java:1070) [?:?]
at java.awt.Component.show(Component.java:1716) [?:?]
at java.awt.Component.setVisible(Component.java:1663) [?:?]
at java.awt.Window.setVisible(Window.java:1021) [?:?]
at java.awt.Dialog.setVisible(Dialog.java:1005) [?:?]
at org.jmeterplugins.repository.PluginManagerMenuItem.actionPerformed(PluginManagerMenuItem.java:100) [jmeter-plugins-manager-1.3.jar:?]
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967) [?:?]
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308) [?:?]
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405) [?:?]
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262) [?:?]
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279) [?:?]
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297) [?:?]
at java.awt.Component.processMouseEvent(Component.java:6636) [?:?]
at javax.swing.JComponent.processMouseEvent(JComponent.java:3342) [?:?]
at java.awt.Component.processEvent(Component.java:6401) [?:?]
at java.awt.Container.processEvent(Container.java:2263) [?:?]
at java.awt.Component.dispatchEventImpl(Component.java:5012) [?:?]
at java.awt.Container.dispatchEventImpl(Container.java:2321) [?:?]
at java.awt.Component.dispatchEvent(Component.java:4844) [?:?]
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918) [?:?]
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547) [?:?]
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488) [?:?]
at java.awt.Container.dispatchEventImpl(Container.java:2307) [?:?]
at java.awt.Window.dispatchEventImpl(Window.java:2762) [?:?]
at java.awt.Component.dispatchEvent(Component.java:4844) [?:?]
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772) [?:?]
at java.awt.EventQueue$4.run(EventQueue.java:721) [?:?]
at java.awt.EventQueue$4.run(EventQueue.java:715) [?:?]
at java.security.AccessController.doPrivileged(AccessController.java:391) [?:?]
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) [?:?]
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95) [?:?]
at java.awt.EventQueue$5.run(EventQueue.java:745) [?:?]
at java.awt.EventQueue$5.run(EventQueue.java:743) [?:?]
at java.security.AccessController.doPrivileged(AccessController.java:391) [?:?]
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) [?:?]
at java.awt.EventQueue.dispatchEvent(EventQueue.java:742) [?:?]
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) [?:?]
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) [?:?]
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) [?:?]
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) [?:?]
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) [?:?]
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90) [?:?]```