IntelliJ Plugin Unable to access local proxy - ipv6/ipv4?

[jwedel]

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I'm using intelliJ in a restricted corporate network. To access the internet, an authenticated proxy is required. To mitigate the issue o authentication, a local proxy is running on localhost:3128.

This is properly configured in IntelliJ and works for everything else.

However, after installing the CoPilot Plugin and attempting to login, I get this:

2023-12-15 11:24:24,567 [65790586]   WARN - #com.github.copilot.lang.agent.AgentGitHubService - Failed to initiate sign in
com.github.copilot.lang.agent.SignInException: Request signInInitiate failed with message: tunneling socket could not be established, cause=connect ECONNREFUSED ::1:3128, request id: 12, error code: -32603
	at com.github.copilot.lang.agent.AgentGitHubService.initiateSignIn(AgentGitHubService.java:198)
	at com.github.copilot.lang.agent.AgentGitHubService.loginInteractive(AgentGitHubService.java:86)
	at com.github.copilot.actions.LoginToGitHubAction.actionPerformed(LoginToGitHubAction.java:18)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.doPerformActionOrShowPopup(ActionUtil.java:344)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.lambda$performActionDumbAwareWithCallbacks$4(ActionUtil.java:318)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.performDumbAwareWithCallbacks(ActionUtil.java:381)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAwareWithCallbacks(ActionUtil.java:318)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.invokeAction(ActionUtil.java:553)
	at com.intellij.ui.popup.ActionPopupStep.performAction(ActionPopupStep.java:258)
	at com.intellij.ui.popup.ActionPopupStep.lambda$onChosen$3(ActionPopupStep.java:235)
	at com.intellij.ui.popup.AbstractPopup.lambda$dispose$18(AbstractPopup.java:1733)
	at com.intellij.openapi.wm.impl.FocusManagerImpl.lambda$doWhenFocusSettlesDown$3(FocusManagerImpl.java:169)
	at com.intellij.util.ui.EdtInvocationManager.invokeLaterIfNeeded(EdtInvocationManager.java:33)
	at com.intellij.ide.IdeEventQueue.ifFocusEventsInTheQueue(IdeEventQueue.kt:220)
	at com.intellij.ide.IdeEventQueue.executeWhenAllFocusEventsLeftTheQueue(IdeEventQueue.kt:186)
	at com.intellij.openapi.wm.impl.FocusManagerImpl.doWhenFocusSettlesDown(FocusManagerImpl.java:165)
	at com.intellij.openapi.wm.impl.FocusManagerImpl.doWhenFocusSettlesDown(FocusManagerImpl.java:159)
	at com.intellij.ui.popup.AbstractPopup.dispose(AbstractPopup.java:1731)
	at com.intellij.ui.popup.WizardPopup.dispose(WizardPopup.java:161)
	at com.intellij.ui.popup.list.ListPopupImpl.dispose(ListPopupImpl.java:407)
	at com.intellij.ui.popup.PopupFactoryImpl$ActionGroupPopup.dispose(PopupFactoryImpl.java:293)
	at com.intellij.openapi.util.ObjectTree.runWithTrace(ObjectTree.java:130)
	at com.intellij.openapi.util.ObjectTree.executeAll(ObjectTree.java:162)
	at com.intellij.openapi.util.Disposer.dispose(Disposer.java:250)
	at com.intellij.openapi.util.Disposer.dispose(Disposer.java:238)
	at com.intellij.ui.popup.WizardPopup.disposeAllParents(WizardPopup.java:269)
	at com.intellij.ui.popup.list.ListPopupImpl.disposePopup(ListPopupImpl.java:518)
	at com.intellij.ui.popup.list.ListPopupImpl.handleNextStep(ListPopupImpl.java:542)
	at com.intellij.ui.popup.list.ListPopupImpl._handleSelect(ListPopupImpl.java:505)
	at com.intellij.ui.popup.list.ListPopupImpl.handleSelect(ListPopupImpl.java:449)
	at com.intellij.ui.popup.PopupFactoryImpl$ActionGroupPopup.handleSelect(PopupFactoryImpl.java:305)
	at com.intellij.ui.popup.list.ListPopupImpl$MyMouseListener.mouseReleased(ListPopupImpl.java:745)
	at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:298)
	at java.desktop/java.awt.Component.processMouseEvent(Component.java:6657)
	at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3385)
	at com.intellij.ui.popup.list.ListPopupImpl$MyList.processMouseEvent(ListPopupImpl.java:810)
	at java.desktop/java.awt.Component.processEvent(Component.java:6422)
	at java.desktop/java.awt.Container.processEvent(Container.java:2266)
	at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5027)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2324)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4855)
	at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4969)
	at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4583)
	at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4524)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2310)
	at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2809)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4855)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:794)
	at java.desktop/java.awt.EventQueue$3.run(EventQueue.java:739)
	at java.desktop/java.awt.EventQueue$3.run(EventQueue.java:733)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:766)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:764)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:763)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.kt:695)
	at com.intellij.ide.IdeEventQueue.dispatchMouseEvent(IdeEventQueue.kt:635)
	at com.intellij.ide.IdeEventQueue._dispatchEvent$lambda$10(IdeEventQueue.kt:580)
	at com.intellij.openapi.application.impl.RwLockHolder.runWithEnabledImplicitRead(RwLockHolder.kt:75)
	at com.intellij.openapi.application.impl.RwLockHolder.runWithImplicitRead(RwLockHolder.kt:67)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:580)
	at com.intellij.ide.IdeEventQueue.access$_dispatchEvent(IdeEventQueue.kt:72)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1.compute(IdeEventQueue.kt:355)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1.compute(IdeEventQueue.kt:354)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:793)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1.invoke(IdeEventQueue.kt:354)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1.invoke(IdeEventQueue.kt:349)
	at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$1(IdeEventQueue.kt:1014)
	at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:114)
	at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:1014)
	at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$7(IdeEventQueue.kt:349)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:848)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:391)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)

What I can see is, that the plugin seems to connect via ipv6 (notice the ::1 which is ipv6 localhost). I assume that either the local proxy does not support ipv6 or the plugin fails to determine which protocol to use.

Even if I setup 127.0.0.1 as hostname instead of localhost, the plugin still tries using ipv6 apparently.

I am not sure if this is the problem but it certainly is suspicious.

[devm33]

I'm not able to reproduce using localhost or 127.0.0.1 on macOS. Which OS are you on and what local proxy are you running? Also what's authentication scheme is the authenticated proxy using?

A couple things to try:

• Instead of using localhost could locally resolve a different domain to localhost (e.g. in /etc/hosts on mac/linux)
• Instead of setting the proxy URL in the IntelliJ settings, try an environment variable http_proxy docs and see if that has the same ipv6 issue.

[markusthamm]

I do not think that the issue exists on MacOS. A colleague of mine has it running on MacOS.

[jwedel]

Hi, I'm an Ventura 13.6.1 atm.

The local proxy is a Bosch built custom proxy.

I finally resolved it using the actually hostname of the authenticated corporate proxy in IntelliJ and using the credentials. This is still weird as all plugins and tools worked with this local proxy settings since ever.

[devm33]

Strange indeed, I'm not sure how localhost or 127.0.0.1 could get remapped to ::1 unless it was something in the machine's host resolution maybe

In any case, glad you were able to find a workaround!

[juliusrennerbosch]

For anyone stumbling upon this in the future: This config works. (BCN Mac, connected to Coporate Network, local proxy from self service not working correctly as described in this issue)

[markusthamm]

Works for me as well. Not fully happy with the workaround though. But can't find any better.

[andriantoeff]

I stumbled the same error with cntlm as my local proxy.

I put localhost as the HTTP Proxy host name in the IntelliJ settings, and got the same error when trying GitHub Copilot plugin: mentioning the IPv6 ::1 in the error message.

In my case, changing the HTTP Proxy host name to 127.0.0.1 solves it.

Apparently, cntlm by default only listen to the IPv4 protocol (127.0.0.1). Though it's still a mystery why localhost got translated to IPv6 even though my hosts file only have 127.0.0.1 mapped for the localhost name.

OS: Windows 10 version 21H2

[lyuzhichao]

It works for me, thank you!