IDE hangs on startup: " No connection established. Last error: read ECONNRESET"

[Octopus1633]

Describe the problem

Arduino IDE hangs forever at the pulsing Arduino logo on startup.

When I invoke Arduino IDE via the command line, I see the following error message in the logs:

Error: 14 UNAVAILABLE: No connection established. Last error: read ECONNRESET (2025-08-08T10:19:55.704Z)

The following is the complete log:

PS C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE> & ".\Arduino IDE"
PS C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE>
Arduino IDE 2.3.6
Checking for frontend application configuration customizations. Module path: C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\electron-main.js, destination 'package.json': C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\package.json
Setting 'theia.frontend.config.appVersion' application configuration value to: "2.3.6" (type of string)
Setting 'theia.frontend.config.cliVersion' application configuration value to: "1.2.0" (type of string)
Setting 'theia.frontend.config.buildDate' application configuration value to: "2025-04-09T11:26:55.498Z" (type of string)
Frontend application configuration after modifications: {"applicationName":"Arduino IDE","defaultTheme":{"light":"arduino-theme","dark":"arduino-theme-dark"},"defaultIconTheme":"none","electron":{"windowOptions":{},"showWindowEarly":true,"splashScreenOptions":{},"uriScheme":"arduino-ide"},"defaultLocale":"","validatePreferencesSchema":false,"reloadOnReconnect":true,"uriScheme":"theia","preferences":{"window.title":"${rootName}${activeEditorShort}${appName}","files.autoSave":"afterDelay","editor.minimap.enabled":false,"editor.tabSize":2,"editor.scrollBeyondLastLine":false,"editor.quickSuggestions":{"other":false,"comments":false,"strings":false},"editor.maxTokenizationLineLength":500,"editor.bracketPairColorization.enabled":false,"breadcrumbs.enabled":false,"workbench.tree.renderIndentGuides":"none","explorer.compactFolders":false},"appVersion":"2.3.6","cliVersion":"1.2.0","buildDate":"2025-04-09T11:26:55.498Z"}
Starting backend process. PID: 36184
Showing main window early
Using browser-only version of superagent in non-browser environment
Configuration directory URI: 'file:///c%3A/Users/zhuangzhanyu/.arduinoIDE'
Configuring to accept webviews on '^.+\.webview\..+$' hostname.
2025-08-08T10:19:55.590Z root INFO Backend u.initialize: 18.9 ms [Finished 0.471 s after backend start]
2025-08-08T10:19:55.591Z root INFO Backend Object.initialize: 17.1 ms [Finished 0.471 s after backend start]
2025-08-08T10:19:55.591Z root INFO Backend a.initialize: 1.0 ms [Finished 0.471 s after backend start]
2025-08-08T10:19:55.591Z root INFO Backend a.initialize: 0.8 ms [Finished 0.471 s after backend start]
2025-08-08T10:19:55.591Z root INFO Backend u.initialize: 1.0 ms [Finished 0.471 s after backend start]
2025-08-08T10:19:55.593Z root INFO Backend l.initialize: 18.0 ms [Finished 0.472 s after backend start]
2025-08-08T10:19:55.597Z root INFO configured all backend app contributions
2025-08-08T10:19:55.598Z root INFO Backend l.onStart: 0.9 ms [Finished 0.479 s after backend start]
2025-08-08T10:19:55.598Z root INFO Backend d.onStart: 0.1 ms [Finished 0.479 s after backend start]
2025-08-08T10:19:55.599Z root INFO Backend a.onStart: 0.2 ms [Finished 0.480 s after backend start]
2025-08-08T10:19:55.599Z config INFO >>> Initializing CLI configuration...
2025-08-08T10:19:55.599Z root INFO Backend x.onStart: 0.3 ms [Finished 0.480 s after backend start]
2025-08-08T10:19:55.599Z config INFO Loading CLI configuration from c:\Users\zhuangzhanyu\.arduinoIDE\arduino-cli.yaml...
2025-08-08T10:19:55.599Z daemon INFO Starting daemon from C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\resources\arduino-cli.exe...
2025-08-08T10:19:55.599Z root INFO Backend w.onStart: 0.3 ms [Finished 0.480 s after backend start]
2025-08-08T10:19:55.599Z discovery-log INFO start
2025-08-08T10:19:55.599Z discovery-log INFO start new deferred
2025-08-08T10:19:55.599Z root INFO Backend v.onStart: 0.1 ms [Finished 0.481 s after backend start]
2025-08-08T10:19:55.599Z root INFO Backend a.onStart: 0.0 ms [Finished 0.481 s after backend start]
2025-08-08T10:19:55.602Z root INFO Theia app listening on http://127.0.0.1:50074.
2025-08-08T10:19:55.602Z root INFO Finished starting backend application: 3.0 ms [Finished 0.484 s after backend start]
2025-08-08T10:19:55.606Z root WARN The local plugin referenced by local-dir:/c%3A/Users/zhuangzhanyu/.arduinoIDE/plugins does not exist.
2025-08-08T10:19:55.606Z root WARN The local plugin referenced by local-dir:/c%3A/Users/zhuangzhanyu/.arduinoIDE/deployedPlugins does not exist.
2025-08-08T10:19:55.606Z root WARN The local plugin referenced by local-dir:C:\Users\zhuangzhanyu\.arduinoIDE\plugins does not exist.
2025-08-08T10:19:55.613Z config INFO Loaded CLI configuration: {"board_manager":{"additional_urls":[]}}
2025-08-08T10:19:55.613Z config INFO Loading fallback CLI configuration to get 'directories.data' and 'directories.user'
2025-08-08T10:19:55.637Z root INFO Resolve plugins list: 36.4 ms [Finished 0.518 s after backend start]
2025-08-08T10:19:55.694Z daemon INFO time="2025-08-08T18:19:55+08:00" level=info msg="arduino-cli version 1.2.0"
time="2025-08-08T18:19:55+08:00" level=info msg="Using config file: c:\\Users\\zhuangzhanyu\\.arduinoIDE\\arduino-cli.yaml"
time="2025-08-08T18:19:55+08:00" level=info msg="Executing `arduino-cli daemon`"
Daemon is now listening on 127.0.0.1:50075
{"IP":"127.0.0.1","Port":"50075"}
2025-08-08T10:19:55.694Z daemon INFO Daemon is running.
2025-08-08T10:19:55.703Z config INFO Loaded fallback CLI configuration: {"directories":{"user":"C:\\Users\\zhuangzhanyu\\Documents\\Arduino","data":"C:\\Users\\zhuangzhanyu\\AppData\\Local\\Arduino15"}}
2025-08-08T10:19:55.703Z config INFO Merged CLI configuration with the fallback: {"directories":{"user":"C:\\Users\\zhuangzhanyu\\Documents\\Arduino","data":"C:\\Users\\zhuangzhanyu\\AppData\\Local\\Arduino15"},"board_manager":{"additional_urls":[]}}
2025-08-08T10:19:55.703Z config INFO Loaded the CLI configuration.
2025-08-08T10:19:55.705Z root ERROR Uncaught Exception:  Error: 14 UNAVAILABLE: No connection established. Last error: read ECONNRESET (2025-08-08T10:19:55.704Z)
2025-08-08T10:19:55.705Z root ERROR Error: 14 UNAVAILABLE: No connection established. Last error: read ECONNRESET (2025-08-08T10:19:55.704Z)
    at t.callErrorFromStatus (C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:3089094)
    at Object.onReceiveStatus (C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:6679669)
    at Object.onReceiveStatus (C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:2572294)
    at Object.onReceiveStatus (C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:2571739)
    at C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:4307911
    at process.processTicksAndRejections (node:internal/process/task_queues:77:11)
for call at
    at s.makeUnaryRequest (C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:6679200)
    at s.create (C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:3088187)
    at instance (C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:6283083)
    at new Promise (<anonymous>)
    at y.createClient (C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:6283060)
    at y.create (C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:6281968)
    at C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:6280864
    at C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:1018551
    at s.invoke (C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:1018641)
    at a.fire (C:\Users\zhuangzhanyu\AppData\Local\Programs\Arduino IDE\resources\app\lib\backend\main.js:2:1020444)
2025-08-08T10:19:55.705Z config INFO Mapped the CLI configuration: {"dataDirUri":"file:///c%3A/Users/zhuangzhanyu/AppData/Local/Arduino15","sketchDirUri":"file:///c%3A/Users/zhuangzhanyu/Documents/Arduino","additionalUrls":[],"network":"none","locale":"en"}
2025-08-08T10:19:55.705Z config INFO Validating the CLI configuration...
2025-08-08T10:19:55.707Z config INFO The CLI config is valid.
2025-08-08T10:19:55.707Z config INFO <<< Initialized the CLI configuration.
2025-08-08T10:19:55.943Z root INFO Deploy plugins list: 343.0 ms [Finished 0.824 s after backend start]
2025-08-08T10:19:56.619Z root INFO creating connection for 1
2025-08-08T10:19:57.324Z root WARN Frontend a.configure took longer than the expected maximum 100 milliseconds: 143.1 ms [Finished 1.716 s after frontend start]
2025-08-08T10:19:57.451Z root WARN A command editor.action.toggleStickyScroll is already registered.
2025-08-08T10:19:57.476Z root WARN Frontend keybindings.onStart took longer than the expected maximum 100 milliseconds: 121.8 ms [Finished 1.861 s after frontend start]
Opening channel for service path '/services/electron-window'.
Opening channel for service path '/services/ide-updater'.
2025-08-08T10:19:57.546Z root INFO Start frontend contributions: 425.0 ms [Finished 1.927 s after frontend start]
2025-08-08T10:19:57.546Z root INFO Changed application state from 'init' to 'started_contributions'.
2025-08-08T10:19:57.555Z root INFO Changed application state from 'started_contributions' to 'attached_shell'.
2025-08-08T10:19:57.555Z root INFO >>> Restoring the layout state...
2025-08-08T10:19:57.599Z root INFO [98573e31-a3f3-4c6d-be10-c0283dd8fe40] Waiting for backend deployment: 64.2 ms [Finished 1.985 s after frontend start]
2025-08-08T10:19:58.083Z root INFO [hosted-plugin: 36904] PLUGIN_HOST(36904) starting instance
[Object: null prototype] {}
2025-08-08T10:19:58.737Z root INFO [98573e31-a3f3-4c6d-be10-c0283dd8fe40] Sync of 23 plugins: 1144.4 ms [Finished 3.130 s after frontend start]

To reproduce

1. Start Arduino IDE.

🐛 It hangs forever at the "splash" animation instead of reaching a functional state.

Expected behavior

Arduino IDE starts up and is functional.

- OR -

If there is a problem with the user's system that prevents Arduino IDE from starting up, it clearly communicates about the problem instead of simply hanging.

Arduino IDE version

2.3.6

Operating system

Windows

Operating system version

11

Additional context

Additional reports

• IDE hangs on startup: " No connection established. Last error: read ECONNRESET" #2766 (comment)

[dexterski007]

I had exactly the same problem and adguard was the culprit, i disabled filtering for arduino-cli and arduino ide and it is working fine now

[ZXD990129]

我遇到了完全相同的问题

[Octopus1633]

I had exactly the same problem and adguard was the culprit, i disabled filtering for arduino-cli and arduino ide and it is working fine now

I blocked these two processes and related directories, and turned off the firewall, but it still cannot be started