claude-code - 💡(How to fix) Fix [BUG] OAuth error: protocol mismatch on macOS [1 comments, 2 participants]

OAuth error: protocol mismatch

• Browser authorization always succeeds but terminal always fails with the same error

Error Messages/Logs

1. Terminal shows OAuth error: protocol mismatch

TL;DR

The "OAuth error: protocol mismatch" suggests a potential issue with the OAuth protocol configuration, which may require adjusting the authentication flow or checking the Claude Code configuration.

Guidance

• Verify that the OAuth protocol configuration in Claude Code matches the expected protocol (e.g., HTTP vs. HTTPS) and check for any redirects or proxy settings that might cause a protocol mismatch.
• Check the Anthropic API documentation to ensure that the OAuth flow is correctly implemented and that there are no specific requirements for the protocol.
• Try running the claude auth login command with additional logging or debugging flags (if available) to gather more information about the error.
• Consider checking the VS Code integrated terminal settings to ensure that it is not interfering with the OAuth flow.

Example

No code snippet is provided as the issue does not contain sufficient information to create a relevant example.

Notes

The issue may be related to the specific configuration of the Anthropic API or the Claude Code version being used. Without more information about the OAuth protocol configuration or the Anthropic API requirements, it is difficult to provide a more specific solution.

Recommendation

Apply workaround: Try adjusting the OAuth protocol configuration or checking for any redirects or proxy settings that might cause a protocol mismatch, as the issue seems to be related to the authentication flow.