CLAUDE_CODE_HOST_SOCKS_PROXY_PORT

Updated October 13, 2026 by Alex Sorokoletov

CLAUDE_CODE_HOST_SOCKS_PROXY_PORT is a Claude Code environment variable: SOCKS proxy port for host. Present since v2.1.69 or earlier and still present in v2.1.294. It is not in the official reference.

How to set it

For one session, export it in the shell that starts Claude Code:

export CLAUDE_CODE_HOST_SOCKS_PROXY_PORT=<value>
claude

To apply it to every session, add it to the env object of a settings file:

// ~/.claude/settings.json
{
  "env": {
    "CLAUDE_CODE_HOST_SOCKS_PROXY_PORT": "<value>"
  }
}

Release notes that mention it

• 83 Undocumented Claude Code Environment Variables (v2.1.19)

Related variables

• CLAUDE_CODE_HOST_HTTP_PROXY_PORT: HTTP proxy port for host.
• CLAUDE_CODE_PROXY_HOST: Proxy hostname, passed alongside the URL so helpers that route credentials by hostname don't need to re-parse.
• CLAUDE_CODE_HTTP_PROXY: Claude-namespaced HTTP proxy URL.
• CLAUDE_CODE_HTTPS_PROXY: Claude-namespaced HTTPS proxy URL.
• CLAUDE_CODE_PROXY_RESOLVES_HOSTS: Proxy handles DNS resolution (skip local DNS).
• CLAUDE_CODE_PROXY_URL: Full proxy URL, injected into the helper subprocess's environment.
• CLAUDE_CODE_SIMULATE_PROXY_USAGE: Simulates proxy-based API routing without an actual proxy.
• HTTP_PROXY: HTTP proxy server URL.

Frequently asked questions

All variables, searchable: Claude Code environment variables.