403 Forbidden Access blocked by Cloudflare

Open 💬 4 comments Opened Jun 12, 2026 by vanloc1808

What version of Codex CLI is running?

0.139.0

What subscription do you have?

ChatGPT Plus

Which model were you using?

gpt-5.5 with xhigh effort

What platform is your computer?

Linux 6.6.87.2-microsoft-standard-WSL2 x86_64 x86_64

What terminal emulator and version are you using (if applicable)?

Windows Terminal WSL

Codex doctor report

{
"schemaVersion": 1,
"generatedAt": "1781235450s since unix epoch",
"overallStatus": "warning",
"codexVersion": "0.139.0",
"checks": {
"app_server.status": {
"id": "app_server.status",
"category": "app-server",
"status": "ok",
"summary": "background server is not running",
"details": {
"control socket": "~/.codex/app-server-control/app-server-control.sock",
"daemon state dir": "~/.codex/app-server-daemon",
"mode": "ephemeral",
"pid file": "~/.codex/app-server-daemon/app-server.pid (missing)",
"settings": "~/.codex/app-server-daemon/settings.json (missing)",
"status": "not running",
"update-loop pid file": "~/.codex/app-server-daemon/app-server-updater.pid (missing)"
},
"remediation": null,
"durationMs": 0
},
"auth.credentials": {
"id": "auth.credentials",
"category": "auth",
"status": "ok",
"summary": "auth is configured",
"details": {
"auth file": "~/.codex/auth.json",
"auth storage mode": "File",
"stored API key": "false",
"stored ChatGPT tokens": "true",
"stored agent identity": "false",
"stored auth mode": "chatgpt"
},
"remediation": null,
"durationMs": 0
},
"config.load": {
"id": "config.load",
"category": "config",
"status": "ok",
"summary": "config loaded",
"details": {
"CODEX_HOME": "~/.codex",
"config.toml": "~/.codex/config.toml",
"config.toml parse": "ok",
"cwd": "/mnt/c/Users/FelixLocNguyen/OneDrive - Eurofins ITWW/Documents/Projects/SemanticLog",
"enabled feature flags": "shell_tool, unified_exec, shell_snapshot, terminal_resize_reflow, sqlite, hooks, enable_request_compression, multi_agent, apps, tool_suggest, plugins, in_app_browser, browser_use, browser_use_external, computer_use, plugin_sharing, image_generation, skill_mcp_dependency_install, steer, guardian_approval, goals, collaboration_modes, tool_call_mcp_elicitation, personality, fast_mode, tui_app_server, workspace_dependencies",
"feature flag overrides": "none",
"feature flags enabled": "27",
"log dir": "~/.codex/log",
"mcp servers": "0",
"model": "gpt-5.5",
"model provider": "openai",
"sqlite home": "~/.codex"
},
"remediation": null,
"durationMs": 0
},
"git.environment": {
"id": "git.environment",
"category": "git",
"status": "ok",
"summary": "git version 2.43.0",
"details": {
".git entry": "directory",
"PATH git #1": "/usr/bin/git",
"PATH git #2": "/bin/git",
"PATH git entries": "2",
"git branch": "main",
"git build options": "git version 2.43.0; cpu: x86_64; no commit associated with this build; sizeof-long: 8; sizeof-size_t: 8; shell-path: /bin/sh",
"git exec path": "/usr/lib/git-core",
"git version": "git version 2.43.0",
"repo detected": "true",
"repo root": "/mnt/c/Users/FelixLocNguyen/OneDrive - Eurofins ITWW/Documents/Projects/SemanticLog",
"selected git": "/usr/bin/git"
},
"remediation": null,
"durationMs": 84
},
"installation": {
"id": "installation",
"category": "install",
"status": "ok",
"summary": "installation looks consistent",
"details": {
"PATH codex #1": "~/.nvm/versions/node/v22.22.2/bin/codex",
"PATH codex #2": "/home/linuxbrew/.linuxbrew/bin/codex",
"PATH codex #3": "/home/linuxbrew/.linuxbrew/bin/codex",
"PATH codex entries": "3",
"current executable": "~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin/codex",
"install context": "npm (package ~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl, bin ~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin, resources ~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-resources, path ~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-path)",
"managed by bun": "false",
"managed by npm": "true",
"managed package root": "~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex",
"npm update target": "~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex"
},
"remediation": null,
"durationMs": 124
},
"mcp.config": {
"id": "mcp.config",
"category": "mcp",
"status": "ok",
"summary": "no MCP servers configured",
"details": {},
"remediation": null,
"durationMs": 0
},
"network.env": {
"id": "network.env",
"category": "network",
"status": "ok",
"summary": "network-related environment looks readable",
"details": {
"SSL_CERT_FILE": "readable file /etc/ssl/certs/ca-certificates.crt",
"proxy env vars": "none"
},
"remediation": null,
"durationMs": 0
},
"network.provider_reachability": {
"id": "network.provider_reachability",
"category": "reachability",
"status": "ok",
"summary": "active provider endpoints are reachable over HTTP",
"details": {
"ChatGPT base URL": "https://chatgpt.com/backend-api/ reachable (HTTP 403)",
"reachability mode": "ChatGPT auth"
},
"remediation": null,
"durationMs": 637
},
"network.websocket_reachability": {
"id": "network.websocket_reachability",
"category": "websocket",
"status": "warning",
"summary": "Responses WebSocket failed; HTTPS fallback may still work",
"details": {
"DNS": "2 IPv4, 2 IPv6, first IPv4",
"auth mode": "chatgpt",
"connect timeout": "15000 ms",
"endpoint": "wss://chatgpt.com/backend-api/<redacted>",
"handshake transport error": "http 403 Forbidden: Some("154e\r\n<!DOCTYPE html>\n<!--[if lt IE 7]> <html class=\\\"no-js ie6 oldie\\\" lang=\\\"en-US\\\"> <![endif]-->\n<!--[if IE 7]>    <html class=\\\"no-js ie7 oldie\\\" lang=\\\"en-US\\\"> <![endif]-->\n<!--[if IE 8]>    <html class=\\\"no-js ie8 oldie\\\" lang=\\\"en-US\\\"> <![endif]-->\n<!--[if gt IE 8]><!--> <html class=\"no-js\" lang=\"en-US\"> <!--<![endif]-->\n<head>\n<title>Attention Required! | Cloudflare</title>\n<meta charset=\"UTF-8\" />\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />\n<meta http-equiv=\"X-UA-Compatible\" content=\"IE=Edge\" />\n<meta name=\"robots\" content=\"noindex, nofollow\" />\n<meta name=\"viewport\" content=\"width=device-width,initial-scale=1\" />\n<link rel=\"stylesheet\" id=\"cf_styles-css\" href=\"/cdn-cgi/styles/cf.errors.css\" />\n<!--[if lt IE 9]><link rel=\\\"stylesheet\\\" id='cf_styles-ie-css' href=\\\"/cdn-cgi/styles/cf.errors.ie.css\\\" /><![endif]-->\n<style>body{margin:0;padding:0}</style>\n\n\n<!--[if gte IE 10]><!-->\n<script>\n  if (!navigator.cookieEnabled) {\n    window.addEventListener('DOMContentLoaded', function () {\n      var cookieEl = document.getElementById('cookie-alert');\n      cookieEl.style.display = 'block';\n    })\n  }\n</script>\n<!--<![endif]-->\n\n\n</head>\n<body>\n  <div id=\"cf-wrapper\">\n    <div class=\"cf-alert cf-alert-error cf-cookie-error\" id=\"cookie-alert\" data-translate=\"enable_cookies\">Please enable cookies.</div>\n    <div id=\"cf-error-details\" class=\"cf-error-details-wrapper\">\n      <div class=\"cf-wrapper cf-header cf-error-overview\">\n        <h1 data-translate=\"block_headline\">Sorry, you have been blocked</h1>\n        <h2 class=\"cf-subheadline\"><span data-translate=\"unable_to_access\">You are unable to access</span> chatgpt.com</h2>\n      </div><!-- /.header -->\n\n      <div class=\"cf-section cf-highlight\">\n        <div class=\"cf-wrapper\">\n          <div class=\"cf-screenshot-container cf-screenshot-full\">\n            \n              <span class=\"cf-no-screenshot error\"></span>\n            \n          </div>\n        </div>\n      </div><!-- /.captcha-container -->\n\n      <div class=\"cf-section cf-wrapper\">\n        <div class=\"cf-columns two\">\n          <div class=\"cf-column\">\n            <h2 data-translate=\"blocked_why_headline\">Why have I been blocked?</h2>\n\n            <p data-translate=\"blocked_why_detail\">This website is using a security service to protect itself from online attacks. The action you just performed triggered the security solution. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data.</p>\n          </div>\n\n          <div class=\"cf-column\">\n            <h2 data-translate=\"blocked_resolve_headline\">What can I do to resolve this?</h2>\n\n            <p data-translate=\"blocked_resolve_detail\">You can email the site owner to let them know you were blocked. Please include what you were doing when this page came up and the Cloudflare")",
"model provider": "openai",
"provider name": "OpenAI",
"proxy env vars": "none",
"supports websockets": "true",
"wire API": "responses"
},
"remediation": "Check proxy, VPN, firewall, DNS, custom CA, and WebSocket policy support.",
"durationMs": 753
},
"runtime.provenance": {
"id": "runtime.provenance",
"category": "runtime",
"status": "ok",
"summary": "running npm on linux-x86_64",
"details": {
"commit": "unknown",
"current executable": "~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin/codex",
"install method": "npm (package ~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl, bin ~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin, resources ~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-resources, path ~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-path)",
"platform": "linux-x86_64",
"version": "0.139.0"
},
"remediation": null,
"durationMs": 0
},
"runtime.search": {
"id": "runtime.search",
"category": "search",
"status": "ok",
"summary": "search is OK (bundled)",
"details": {
"search command": "~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-path/rg",
"search command readiness": "file exists",
"search provider": "bundled"
},
"remediation": null,
"durationMs": 0
},
"sandbox.helpers": {
"id": "sandbox.helpers",
"category": "sandbox",
"status": "ok",
"summary": "sandbox configuration is readable",
"details": {
"approval policy": "OnRequest",
"codex-linux-sandbox helper": "~/.codex/tmp/arg0/codex-arg0VyzlHP/codex-linux-sandbox",
"execve wrapper helper": "~/.codex/tmp/arg0/codex-arg0VyzlHP/codex-execve-wrapper",
"filesystem sandbox": "restricted",
"network sandbox": "restricted"
},
"remediation": null,
"durationMs": 0
},
"state.paths": {
"id": "state.paths",
"category": "state",
"status": "ok",
"summary": "state paths and databases are inspectable",
"details": {
"CODEX_HOME": "~/.codex (dir)",
"active rollout files": "11 files, 4625413 total bytes, 420492 average bytes",
"archived rollout files": "0 files, 0 total bytes, 0 average bytes",
"goals DB": "~/.codex/goals_1.sqlite (file)",
"goals DB integrity": "ok",
"log DB": "~/.codex/logs_2.sqlite (file)",
"log DB integrity": "ok",
"log dir": "~/.codex/log (dir)",
"memories DB": "~/.codex/memories_1.sqlite (file)",
"memories DB integrity": "ok",
"sqlite home": "~/.codex (dir)",
"state DB": "~/.codex/state_5.sqlite (file)",
"state DB integrity": "ok"
},
"remediation": null,
"durationMs": 1958
},
"state.rollout_db_parity": {
"id": "state.rollout_db_parity",
"category": "threads",
"status": "ok",
"summary": "rollout files and state DB thread inventory agree",
"details": {
"default model provider": "openai",
"rollout DB active files": "11",
"rollout DB active rows": "11",
"rollout DB archive mismatches": "0",
"rollout DB archived files": "0",
"rollout DB archived rows": "0",
"rollout DB duplicate DB paths": "0",
"rollout DB duplicate rollout thread ids": "0",
"rollout DB malformed file names": "0",
"rollout DB missing active rows": "0",
"rollout DB missing archived rows": "0",
"rollout DB model providers": "openai=11",
"rollout DB rows": "11",
"rollout DB scan cap reached": "false",
"rollout DB scan errors": "0",
"rollout DB sources": "cli=10, vscode=1",
"rollout DB stale rows": "0"
},
"remediation": null,
"durationMs": 250
},
"system.environment": {
"id": "system.environment",
"category": "system",
"status": "ok",
"summary": "OS language C",
"details": {
"EDITOR": "not set",
"LANG": "C.UTF-8",
"LESS": "set",
"PAGER": "set",
"VISUAL": "not set",
"os": "Ubuntu 24.4.0 (noble) [64-bit]",
"os language": "C",
"os type": "Ubuntu",
"os version": "24.4.0"
},
"remediation": null,
"durationMs": 15
},
"terminal.env": {
"id": "terminal.env",
"category": "terminal",
"status": "ok",
"summary": "terminal metadata was detected",
"details": {
"DISPLAY": "present",
"WAYLAND_DISPLAY": "present",
"WSL_DISTRO_NAME": "present",
"WSL_INTEROP": "present",
"WT_SESSION": "present",
"color output": "enabled",
"effective locale": "C.UTF-8",
"stderr is terminal": "true",
"stdin is terminal": "true",
"stdout is terminal": "true",
"terminal": "Windows Terminal",
"terminal size": "156x45"
},
"remediation": null,
"durationMs": 0
},
"terminal.title": {
"id": "terminal.title",
"category": "title",
"status": "ok",
"summary": "terminal title default",
"details": {
"terminal title activity": "true",
"terminal title items": "activity, project-name",
"terminal title project source": "git repo root",
"terminal title project value": "SemanticLog",
"terminal title source": "default"
},
"remediation": null,
"durationMs": 0
},
"updates.status": {
"id": "updates.status",
"category": "updates",
"status": "ok",
"summary": "update configuration is locally consistent",
"details": {
"cached latest version": "0.139.0",
"check for update on startup": "true",
"last checked at": "2026-06-12T02:39:36.735734617Z",
"latest version": "0.139.0",
"latest version status": "current version is not older",
"npm update target": "~/.nvm/versions/node/v22.22.2/lib/node_modules/@openai/codex",
"update action": "npm install -g @openai/codex",
"version cache": "~/.codex/version.json"
},
"remediation": null,
"durationMs": 1272
}
}
}

I couldn't reveal my username, so that replace it with `~` directory.

What issue are you seeing?

Any prompts, I see

⚠ Falling back from WebSockets to HTTPS transport. Access blocked by Cloudflare. This usually happens when connecting from a restricted region (status 403
  Forbidden), url: wss://chatgpt.com/backend-api/codex/responses, cf-ray: a0a5936a3bb7dd6c-HKG

■ unexpected status 403 Forbidden: <html>
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
;opacity:50%;text-align:center;width:100%}.explanation a{color:#000}@media (prefers-color-scheme:dark){body{background-color:#343541;c..., url:
https://chatgpt.com/backend-api/codex/responses, cf-ray: a0a5c51eae4803b3-HKG

I can use ChatGPT on the website, but not the Codex CLI. My region is Vietnam, which is included in Codex supported regions.

What steps can reproduce the bug?

Just run the codex command and say "Hello" to it.

What is the expected behavior?

I could use Codex normally as before. Yesterday I can still use it.

Additional information

_No response_

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