[MacOS] Signal desktop fails to start behind enterprise proxy

[denics]

• I have searched open and closed issues for duplicates

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Bug description

Dear all, I love Signal and I am using it on my phones and Linux desktops. However, at work, I am using a Mac and the application, v1.14.4 simply wont start with the message:

Something went wrong! Failed to connect to server.

It seems to me that this is related to #2278 and #1632

Steps to reproduce

1. At work, open Signal

Actual result:

Does not connect to the server

Expected result:

I should be able to enjoy the application

Screenshots

Platform info

• Signal version:

  1.14.4

• Operating System:

  MacOS X High Sierra 10.13.6

• Linked device version:

  No linked device (I cannot access the application)

Link to debug log

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Signal/1.14.4 Chrome/61.0.3163.100 Electron/2.0.1 Safari/537.36 node/8.9.3 env/production
INFO  2018-07-23T09:18:33.689Z app ready
INFO  2018-07-23T09:18:33.697Z Ensure attachments directory exists
INFO  2018-07-23T09:18:33.766Z Initializing BrowserWindow config: {"show":true,"width":800,"height":610,"minWidth":640,"minHeight":360,"autoHideMenuBar":false,"webPreferences":{"nodeIntegration":false,"nodeIntegrationInWorker":false,"preload":"[REDACTED]/app.asar/preload.js","nativeWindowOpen":true},"icon":"[REDACTED]/app.asar/images/icon_256.png","maximized":false,"x":-2219,"y":421}
ERROR 2018-07-23T09:18:34.343Z Error: Error: net::ERR_CONNECTION_CLOSED
    at CancellationToken.createPromise ([REDACTED]/app.asar/node_modules/builder-util-runtime/src/CancellationToken.ts:51:5)
    at ElectronHttpExecutor.doApiRequest ([REDACTED]/app.asar/node_modules/builder-util-runtime/src/httpExecutor.ts:81:30)
    at ElectronHttpExecutor.request ([REDACTED]/app.asar/node_modules/builder-util-runtime/src/httpExecutor.ts:73:17)
    at GenericProvider.httpRequest ([REDACTED]/app.asar/node_modules/electron-updater/src/Provider.ts:26:26)
    at [REDACTED]/app.asar/node_modules/electron-updater/src/GenericProvider.ts:24:45
    at Generator.next (<anonymous>)
From previous event:
    at GenericProvider.getLatestVersion ([REDACTED]/app.asar/node_modules/electron-updater/out/GenericProvider.js:98:7)
    at [REDACTED]/app.asar/node_modules/electron-updater/src/AppUpdater.ts:304:25
    at Generator.next (<anonymous>)
    at runCallback (timers.js:789:20)
    at tryOnImmediate (timers.js:751:5)
    at processImmediate [as _immediateCallback] (timers.js:722:5)
From previous event:
    at MacUpdater.getUpdateInfo ([REDACTED]/app.asar/node_modules/electron-updater/out/AppUpdater.js:460:7)
    at [REDACTED]/app.asar/node_modules/electron-updater/src/AppUpdater.ts:308:35
    at Generator.next (<anonymous>)
From previous event:
    at MacUpdater.doCheckForUpdates ([REDACTED]/app.asar/node_modules/electron-updater/out/AppUpdater.js:502:7)
    at [REDACTED]/app.asar/node_modules/electron-updater/src/AppUpdater.ts:279:25
    at Generator.next (<anonymous>)
    at runCallback (timers.js:789:20)
    at tryOnImmediate (timers.js:751:5)
    at processImmediate [as _immediateCallback] (timers.js:722:5)
From previous event:
    at MacUpdater._checkForUpdates ([REDACTED]/app.asar/node_modules/electron-updater/out/AppUpdater.js:433:7)
    at MacUpdater.checkForUpdates ([REDACTED]/app.asar/node_modules/electron-updater/src/AppUpdater.ts:217:35)
    at checkForUpdates ([REDACTED]/app.asar/app/auto_update.js:22:15)
    at Object.initialize ([REDACTED]/app.asar/app/auto_update.js:78:3)
    at logging.initialize.catch.then ([REDACTED]/app.asar/main.js:625:18)
    at <anonymous>
INFO  2018-07-23T09:18:34.343Z Got an error while updating:  Error: net::ERR_CONNECTION_CLOSED
    at CancellationToken.createPromise ([REDACTED]/app.asar/node_modules/builder-util-runtime/src/CancellationToken.ts:51:5)
    at ElectronHttpExecutor.doApiRequest ([REDACTED]/app.asar/node_modules/builder-util-runtime/src/httpExecutor.ts:81:30)
    at ElectronHttpExecutor.request ([REDACTED]/app.asar/node_modules/builder-util-runtime/src/httpExecutor.ts:73:17)
    at GenericProvider.httpRequest ([REDACTED]/app.asar/node_modules/electron-updater/src/Provider.ts:26:26)
    at [REDACTED]/app.asar/node_modules/electron-updater/src/GenericProvider.ts:24:45
    at Generator.next (<anonymous>)
From previous event:
    at GenericProvider.getLatestVersion ([REDACTED]/app.asar/node_modules/electron-updater/out/GenericProvider.js:98:7)
    at [REDACTED]/app.asar/node_modules/electron-updater/src/AppUpdater.ts:304:25
    at Generator.next (<anonymous>)
    at runCallback (timers.js:789:20)
    at tryOnImmediate (timers.js:751:5)
    at processImmediate [as _immediateCallback] (timers.js:722:5)
.
.
.

INFO  2018-07-24T08:31:51.919Z Remove all notifications
INFO  2018-07-24T08:31:52.918Z Update notifications: {"shouldClearNotifications":false,"shouldPlayNotificationSound":false,"shouldShowNotifications":false,"type":"disabled","isNotificationGroupingSupported":true}
INFO  2018-07-24T08:31:54.550Z opening provisioning socket https://textsecure-service.whispersystems.org
INFO  2018-07-24T08:31:54.651Z provisioning socket closed 1006
INFO  2018-07-24T08:31:54.651Z provisioning failed Error: websocket closed
    at W3CWebSocket.socket.onclose (file://[REDACTED]/app.asar/js/libtextsecure.js:37594:22)
    at W3CWebSocket._dispatchEvent [as dispatchEvent] ([REDACTED]/app.asar/node_modules/yaeti/lib/EventTarget.js:107:17)
    at W3CWebSocket.onConnectFailed ([REDACTED]/app.asar/node_modules/websocket/lib/W3CWebSocket.js:219:14)
    at WebSocketClient.<anonymous> ([REDACTED]/app.asar/node_modules/websocket/lib/W3CWebSocket.js:59:25)
    at emitOne (events.js:116:13)
    at WebSocketClient.emit (events.js:211:7)
    at ClientRequest.handleRequestError ([REDACTED]/app.asar/node_modules/websocket/lib/WebSocketClient.js:215:14)
    at emitOne (events.js:116:13)
    at ClientRequest.emit (events.js:211:7)
    at TLSSocket.socketErrorListener (_http_client.js:387:9)
INFO  2018-07-24T08:31:57.199Z Loaded this list of log files from logPath: log.log, log.log.0

[scottnonnenberg-signal]

It's definitely the same thing as #1632.

Try the environment variables mentioned in that issue, see if it changes the error message you're getting.