[BUG] Desktop app SSH remote session fails with 403 Request not allowed while Local session and CLI-over-SSH work fine (same account)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

What happens:
In the desktop app, any message (even just hi) sent in an SSH remote session returns:
Failed to authenticate. API Error: 403 Request not allowed
A Local session in the same desktop app, signed in with the same account, works normally.

Key contrast that isolates it:
SSH-ing into the same remote server and running the claude CLI directly, with the same account (Claude Pro), works perfectly — including Opus 4.8. So the server's network, egress IP, credentials, and account entitlements are all fine. The 403 only appears on the desktop app's SSH-remote path.

Already ruled out:

• SSH connection itself is fine (host-key issue resolved separately)
• Remote ~/.claude/settings.json is {"model": "opus", ...} — no gated model
• env | grep -i anthropic on the server is empty (no stray ANTHROPIC_API_KEY / ANTHROPIC_BASE_URL); also checked under non-interactive shell
• Local and remote sessions are signed into the same account
• Tried: full sign-out + Cmd+Q + browser OAuth re-login; removed and re-added the SSH environment — still 403

Environment:

• Claude Code: v2.1.168 (remote server side)
• Desktop app version: Claude 1.15200.0 (250bae)
• Local OS: macOS
• Remote: Linux server, SSH port 2222
• Plan: Claude Pro

Reproducible: Yes — Local session always works, SSH remote session always 403s.

What Should Happen?

Successfully work with claude code with ssh connected to the remote server on ios DESKTOP app.

Error Messages/Logs

Authentication failed
Sign in again to continue.
Failed to authenticate. API Error: 403 Request not allowed

Steps to Reproduce

Login to the mac claude desktop app, establish ssh to the remote server successfully, then talk to claude.

Claude Model

_No response_

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.168

Platform

Other

Operating System

macOS

Terminal/Shell

Other

Additional Information

<img width="509" height="188" alt="Image" src="https://github.com/user-attachments/assets/34ef2451-14ce-4043-bd9d-5a76cc14a471" />