Sidebar renderer_ready_timeout

“The Codex app-server starts successfully, but the sidebar never becomes ready.”

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I hit this bug: rapsheet.dev/sheets/codex/issues/20880/file
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Fading. 14 reports and thumbs-up in the last 7 days and 35 the week before. A workaround is known.

Codex sidebar never loads with renderer_ready_timeout on Windows. After about 30 seconds the sidebar shows "Codex could not start" even though the codex app-server starts and initializes.

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File my report

Where: VS Code extension
Error text: [CodexWebviewProvider] Webview renderer did not become ready
[error] [CodexWebviewProvider] Webview renderer did not become ready elapsedMs=29999 extensionVersion=26.1021.22027 reason=renderer_ready_timeout…Pasted in 4 reports
Versions: 0.162.0 to 26.51021.22027. Still reported on the newest version, 26.51021.22027.
Platforms: Linux, macOS, Windows
How bad: Breaks a normal workflow. Some reports say it used to work. Some reports say it blocks them completely.

Part of: Codex VS Code extension shows "Codex could not start" and its sidebar UI never loads9 bugs

Original reports28, newest first

Nov 6, 2026VS Code extension sidebar never loads — renderer_ready_timeoutOn GitHub#59865
Nov 6, 2026Codex could not startOn GitHub#59857
Nov 5, 2026VS Code Codex sidebar renderer times out after 30 secondsOn GitHub#59625
Nov 4, 2026Codex VS Code extension fails to initialize webview — renderer_ready_timeout on Windows 11On GitHub#59470
Nov 4, 2026[VS Code][Windows] Codex 26.1021.22027 intermittently fails to initialize its sidebar in a clean profileOn GitHub#59425
Nov 3, 2026Codex Extension failed in Visual Studio CodeOn GitHub#59151
Nov 2, 2026[Windows 10][VS Code] Codex 26.1021.22027 sidebar renderer_ready_timeout despite successful app-server initOn GitHub#58928
Nov 2, 2026Codex Fails to Start When Opening the Codex on WindowsOn GitHub#58866
Nov 1, 2026Why are you neglecting VS Code users?On GitHub Discussions#58810
Nov 1, 2026Bug of Extension in VS CodeOn GitHub#58803

Show all 28Show only the newest 10

Oct 31, 2026Codex VS Code extension webview fails on Windows 11 — rollback resolves issueOn GitHub#58582
Oct 30, 2026[Windows][VS Code] Codex 26.1021.22027 UI fails with renderer_ready_timeout; same UI error on a second computerOn GitHub#58354
Oct 29, 2026[Windows][VS Code] UI startup failure on 26.1021.22027; account requests and feedback fail on 26.1007.21434On GitHub#58150
Oct 28, 2026[Windows] "Codex could not start – The extension could not start its user interface" (v26.51021.22027)On GitHub#57762
Oct 28, 2026[Linux/Wayland] Codex 26.1021.22027 fails to start UI and freezes VS Code 1.143.1 — downgrade fixes itOn GitHub#57759
Oct 28, 2026Recurring Codex VS Code extension startup failure on WindowsOn GitHub#57731
Oct 27, 2026Codex could not start The extension could not start its user interface.On GitHub#57600
Oct 27, 2026Error in VS while connecting codexOn the forum#1410267
Oct 27, 2026IDE extension webview fails at hard-coded 30-second startup timeout; timeout is not configurable and webview payload is 657 MiBOn GitHub#57531
Oct 27, 2026Title: Codex sidebar fails with renderer_ready_timeout on VS Code 1.143.1 (Windows 11), clean profileOn GitHub#57528
Oct 27, 2026[Windows / VS Code] 26.1021.22027 sidebar renderer_ready_timeout; rollback to 26.930.41038 restores startupOn GitHub#57421
Oct 27, 2026VS Code extension 26.1021.22027 fails to load UI on Windows — renderer_ready_timeoutOn GitHub#57368
Oct 27, 2026Title: [BUG][Windows][VS Code] Codex v26.1021.22027 fails to start UI — v26.1007.21434 worksOn GitHub#57344
Oct 26, 2026Title: [Windows] Codex VS Code extension fails to start — renderer_ready_timeoutOn GitHub#57064
Oct 25, 2026[VS Code Extension] Codex UI fails to start — renderer_ready_timeout after 30 seconds (Windows)On GitHub#56858
Oct 24, 2026Windows 10 (local VS Code): Codex IDE extension 26.1021.22027 fails with renderer_ready_timeout; 26.1007.21434 worksOn GitHub#56780
Oct 24, 2026VS Code extension 26.1021.22027: Codex UI fails to start with renderer_ready_timeoutOn GitHub#56710
Oct 24, 2026[macOS Intel][VS Code] 26.1021.22027 fails with renderer_ready_timeout; 26.1007.21434 worksOn GitHub#56660