Bug Report: Codex CLI Login Fails on Termux (Android) — Token Exchange Error
Summary
Codex CLI on Termux (Android) consistently fails during the OAuth token exchange step.
The browser callback to localhost:1455 succeeds, but Codex errors when POSTing to:
https://auth.openai.com/oauth/token
This appears to be the same failure pattern reported on Linux/WSL, but occurring on Termux as well.
Environment
Device: Samsung Galaxy S23 Ultra
OS: Android 13
Shell: Termux (latest packages)
Codex CLI version: codex --version → (fill this in)
Install method:
cargo install --git https://github.com/openai/codex
--tag rust-v0.50.0
codex-cli --force --locked
Rust version: (optional but helpful — rustc --version)
Steps to Reproduce
-
Build and install Codex CLI on Termux using cargo.
-
Run:
codex login
-
Browser opens normally and authenticates successfully.
-
Browser redirects back to:
http://localhost:1455/auth/callback
(This callback works.)
- Codex attempts token exchange and then fails consistently.
Observed Behavior
CLI prints:
Starting local login server on http://localhost:1455.
If your browser did not open, navigate to this URL to authenticate:
https://auth.openai.com/oauth/authorize?....
Token exchange error: error sending request for url (https://auth.openai.com/oauth/token)
This happens every time.
Network / TLS Verification
Connectivity and TLS appear correct.
From the same Termux session:
curl -v https://auth.openai.com/oauth/token
Returns:
{
"error": {
"message": "Invalid method for URL (GET /oauth/token)",
"type": "invalid_request_error",
"param": null,
"code": null
}
}
This confirms:
DNS works
HTTPS/TLS handshake succeeds
CA bundle is valid
Server is reachable
So the issue is not a Termux network or certificate problem.
What I Already Tried
Reinstalled Codex CLI via cargo
Deleted Codex state:
rm -rf ~/.codex
Re-ran codex login multiple times
Reinstalled ca-certificates & openssl in Termux
Verified TLS works with curl
Confirmed browser callback hits localhost:1455 successfully
The error always occurs at the same token-exchange step.
Expected Behavior
Codex CLI should successfully POST to:
https://auth.openai.com/oauth/token
and complete the login flow, as it does on desktop Linux/macOS.
Notes
This appears to match the open issues where Codex login fails on Linux/WSL with the exact same error:
Token exchange failed: error sending request for url (https://auth.openai.com/oauth/token)
Since Termux demonstrates identical behavior with working TLS, this may indicate an upstream issue in the CLI's token-exchange logic rather than a local environment misconfiguration.
Request
Could you confirm whether this is a known issue with the OAuth/token flow and whether Termux/Android is expected to be supported?
Bug Report: Codex CLI Login Fails on Termux (Android) — Token Exchange Error
Summary
Codex CLI on Termux (Android) consistently fails during the OAuth token exchange step.
The browser callback to localhost:1455 succeeds, but Codex errors when POSTing to:
https://auth.openai.com/oauth/token
This appears to be the same failure pattern reported on Linux/WSL, but occurring on Termux as well.
Environment
Device: Samsung Galaxy S23 Ultra
OS: Android 13
Shell: Termux (latest packages)
Codex CLI version: codex --version → (fill this in)
Install method:
cargo install --git https://github.com/openai/codex
--tag rust-v0.50.0
codex-cli --force --locked
Rust version: (optional but helpful — rustc --version)
Steps to Reproduce
Build and install Codex CLI on Termux using cargo.
Run:
codex login
Browser opens normally and authenticates successfully.
Browser redirects back to:
http://localhost:1455/auth/callback
(This callback works.)
Observed Behavior
CLI prints:
Starting local login server on http://localhost:1455.
If your browser did not open, navigate to this URL to authenticate:
https://auth.openai.com/oauth/authorize?....
Token exchange error: error sending request for url (https://auth.openai.com/oauth/token)
This happens every time.
Network / TLS Verification
Connectivity and TLS appear correct.
From the same Termux session:
curl -v https://auth.openai.com/oauth/token
Returns:
{
"error": {
"message": "Invalid method for URL (GET /oauth/token)",
"type": "invalid_request_error",
"param": null,
"code": null
}
}
This confirms:
DNS works
HTTPS/TLS handshake succeeds
CA bundle is valid
Server is reachable
So the issue is not a Termux network or certificate problem.
What I Already Tried
Reinstalled Codex CLI via cargo
Deleted Codex state:
rm -rf ~/.codex
Re-ran codex login multiple times
Reinstalled ca-certificates & openssl in Termux
Verified TLS works with curl
Confirmed browser callback hits localhost:1455 successfully
The error always occurs at the same token-exchange step.
Expected Behavior
Codex CLI should successfully POST to:
https://auth.openai.com/oauth/token
and complete the login flow, as it does on desktop Linux/macOS.
Notes
This appears to match the open issues where Codex login fails on Linux/WSL with the exact same error:
Token exchange failed: error sending request for url (https://auth.openai.com/oauth/token)
Since Termux demonstrates identical behavior with working TLS, this may indicate an upstream issue in the CLI's token-exchange logic rather than a local environment misconfiguration.
Request
Could you confirm whether this is a known issue with the OAuth/token flow and whether Termux/Android is expected to be supported?