インストール後、ThingWorx Flow ログインページが「502 Bad Gateway」または「504 Gateway Timeout」エラーで読み込まれない

• ThingWorx Flow ホームページにアクセスできませんでした
• ThingWorx Flowモジュールはオンラインですが、ログインを試みると502 Bad Gateway nginxが返されます
• Web ブラウザでF12 /開発者ツールを使用すると、 currentUser API 呼び出しで以下のエラーが返されることが示されます。

 Failed to load resource: the server responded with a status of 504 (Gateway Timeout) - HTTP 504 Gateway Timeout

• ログインウィンドウが表示されない
• 自己署名証明書を使用している場合、ThingWorx Flow にアクセスできません
• WebブラウザでF12 /開発者ツールを使用すると、 fetchconfigがステータス502を返すことがわかります。
• ログインページにアクセスしようとすると504 Gateway timeoutが表示される
• trigger_error-xxxx.logには以下のエラーが含まれています:

   {"module":"flow-trigger","timestamp":"YYYY-MM-DDThh:mm:ss.965Z","level":"error","message":"Error deleting from message table"} {"module":"flow-trigger","timestamp":"YYYY-MM-DDThh:mm:ss.965Z","level":"error","message":"Login failed for user &#39;<user_name>&#39;."} {"module":"flow-trigger","timestamp":"YYYY-MM-DDThh:mm:ss.965Z","level":"error","message":"Error: Login failed for user &#39;<user_name>&#39;. at Login7TokenHandler.onErrorMessage (D:\\ThingWorxFlow\\modules\\trigger\\node_modules\\tedious\\lib\\token\\handler.js:239:19) at Readable.&lt;anonymous&gt; (D:\\ThingWorxFlow\\modules\\trigger\\node_modules\\tedious\\lib\\token\\token-stream-parser.js:26:33) at Readable.emit (events.js:315:20) at addChunk (internal/streams/readable.js:309:12) at readableAddChunk (internal/streams/readable.js:284:9) at Readable.push (internal/streams/readable.js:223:10) at next (internal/streams/from.js:88:29) at runMicrotasks (&lt;anonymous&gt;) at processTicksAndRejections (internal/process/task_queues.js:93:5)"} {"module":"flow-trigger","timestamp":"YYYY-MM-DDThh:mm:ss.966Z","level":"error","message":"Error updating subscriptions"} {"module":"flow-trigger","timestamp":"YYYY-MM-DDThh:mm:ss.966Z","level":"error","message":"Login failed for user &#39;<user_name>&#39;."} {"module":"flow-trigger","timestamp":"YYYY-MM-DDThh:mm:ss.966Z","level":"error","message":"Error: Login failed for user &#39;<user_name>&#39;. at Login7TokenHandler.onErrorMessage (D:\\ThingWorxFlow\\modules\\trigger\\node_modules\\tedious\\lib\\token\\handler.js:239:19) at Readable.&lt;anonymous&gt; (D:\\ThingWorxFlow\\modules\\trigger\\node_modules\\tedious\\lib\\token\\token-stream-parser.js:26:33) at Readable.emit (events.js:315:20) at addChunk (internal/streams/readable.js:309:12) at readableAddChunk (internal/streams/readable.js:284:9) at Readable.push (internal/streams/readable.js:223:10) at next (internal/streams/from.js:88:29) at runMicrotasks (&lt;anonymous&gt;) at processTicksAndRejections (internal/process/task_queues.js:93:5)"}

• Flow のホスト名と URL 経由で ThingWorx Flow にアクセスできますが、 ThingWorx Composer > Flow > Connectorの ThingWorx Composer URL からはアクセスできず、以下のエラーが発生します。

404 page not found error

• システム > サブシステム > ワークフロー サブシステムからValidateFlowSetup を実行するときにエラーが発生しました

[FLOW-API-02] - Failed to connect to Flow. Ensure that you are accessing ThingWorx via Nginx URL. Ensure that all Flow services are running and are healthy. In case of self-signed certificate, make sure that correct CN is provided. [FLOW-OAUTH-02] - Failed to connect to Flow OAuth service. Check whether Flow keys are imported in ThingWorx KeyStore. For more information, refer to the 'Troubleshooting Your Installation' topic in the Help Center

• ThingWorx Flow ログ ファイル,,,\ThingWorxFlow\.pm2\logs\ flow-api-error-0.logにエラー メッセージが表示されます:

 TypeError: Cannot read property 'statusCode' of undefined
    at /opt/ThingWorxFlow/modules/ux/dist/helpers/twxUserHelper.js:25:285
    at Request._callback (/opt/ThingWorxFlow/modules/ux/dist/helpers/twxUserHelper.js:8:977)
    at self.callback (/opt/ThingWorxFlow/modules/ux/node_modules/request/request.js:185:22)
    at Request.emit (events.js:314:20)
    at Request.onRequestError (/opt/ThingWorxFlow/modules/ux/node_modules/request/request.js:881:8)
    at ClientRequest.emit (events.js:314:20)
    at ClientRequest.onConnect (/opt/ThingWorxFlow/modules/ux/node_modules/tunnel-agent/index.js:168:23)
    at Object.onceWrapper (events.js:421:26)
    at ClientRequest.emit (events.js:314:20)
    at Socket.socketOnData (_http_client.js:508:11)
    at Socket.emit (events.js:314:20)
    at addChunk (_stream_readable.js:297:12)
    at readableAddChunk (_stream_readable.js:272:9)
    at Socket.Readable.push (_stream_readable.js:213:10)
    at TCP.onStreamRead (internal/stream_base_commons.js:188:23)
Uncaught exception: TypeError: Cannot read property 'statusCode' of undefined