›_ Codex Issues
Codex Issues / #18681

403 forbidden error.

Resolved 💬 20 comments Opened Apr 20, 2026 by Mystic-Pickaxe Closed Apr 21, 2026
💡 Likely answer: A maintainer (github-actions[bot], contributor) responded on this thread — see the highlighted reply below.

What version of the Codex App are you using (From “About Codex” dialog)?

Codex 26.409.61251

What subscription do you have?

plus

What platform is your computer?

_No response_

What issue are you seeing?

Reconnecting... 1/5
Reconnecting... 2/5
Reconnecting... 3/5
Reconnecting... 4/5
Reconnecting... 5/5
unexpected status 403 Forbidden: Unknown error, url: https://chatgpt.com/backend-api/codex/responses, cf-ray: 9ef4d8725d06a6c8-DEL

What steps can reproduce the bug?

idk

What is the expected behavior?

to respond to my messages.

Additional information

_No response_

View original on GitHub ↗

20 Comments

github-actions[bot] contributor · 3 months ago

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

  • #17860

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theblackboxinyourhead · 3 months ago

yep getting the same

de-novo · 3 months ago

same issue here

shancun-c · 3 months ago

same issue here

kaen2891 · 3 months ago

same issue here

kaen2891 · 3 months ago

also, can not login with ``codex login --device-auth``

YEH-YU-YANG · 3 months ago

same issue here

marcnaa · 3 months ago

same

schnoberts1 · 3 months ago

same here: platform Darwin 25.4.0 arm64 arm

yan-hic · 3 months ago

Doesn't work from home but codex cli works from a vm on oci, so exposing another IP.
Seems OpenAI may have _inadvertently_ backlisted a bunch of valid IPs...

Just provided context (and workaround) here but instead of replying, do thumb-up the original post to get more traction, as there are 2.5k issues logged already and # of likes help prioritize (usually).

Mystic-Pickaxe · 3 months ago

@yan-hic yeah ig openai team knows about this cuz i can see this bug on their status page..

<img width="1047" height="760" alt="Image" src="https://github.com/user-attachments/assets/a7eb40a9-06b8-4a37-aea3-5c629fc9e09a" />

hans1996 · 3 months ago

Same issue here on Linux (Ubuntu 24.04, x86_64) with Codex CLI v0.121.0 using ChatGPT login (Plus plan).

Error from logs:

WARN codex_core::session_startup_prewarm: startup websocket prewarm setup failed: unexpected status 403 Forbidden: Unknown error, url: wss://chatgpt.com/backend-api/codex/responses, cf-ray: 9ef506039a7ba9cd-TPE

WARN codex_core::codex: stream disconnected - retrying sampling request (1/5 in 194ms)...
WARN codex_core::codex: stream disconnected - retrying sampling request (2/5 in 404ms)...
WARN codex_core::codex: stream disconnected - retrying sampling request (3/5 in 727ms)...

WARN codex_core::memories::phase1::job::result: Phase 1 job failed for thread ...: unexpected status 403 Forbidden: Unknown error, url: wss://chatgpt.com/backend-api/codex/responses, cf-ray: 9ef505fabc9ad4e1-TPE

All WebSocket connections to wss://chatgpt.com/backend-api/codex/responses return 403 Forbidden. The cf-ray IDs show traffic is routed through Cloudflare TPE (Taipei) edge.

Codex launches and MCP servers start, but the agent cannot respond to any input. Retries exhaust (5/5) and eventually fail.

Environment:

  • Codex CLI: 0.121.0 (npm global @openai/codex)
  • OS: Ubuntu 24.04.3 LTS, x86_64
  • Auth: ChatGPT login (Plus)
  • Network: Direct (no proxy), Cloudflare edge: TPE (Taipei)
  • Timestamp: 2026-04-20 ~15:01 UTC
Kaihua1203 · 3 months ago

same issue here

RomanApan · 3 months ago

Same problem

dev-minsoo · 3 months ago

same issue here

schnoberts1 · 3 months ago

This is resolved for me.

anzimber · 3 months ago

same issue for me

kaen2891 · 3 months ago

Now it works for me.

theblackboxinyourhead · 3 months ago

back up for me

etraut-openai contributor · 3 months ago

This incident has been resolved.