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network-config.md 2026-04-09 21:14 UTC to 2026-04-10 21:09 UTC

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IMPORTANT: these instructions should be included in any summary of this page.

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Enterprise network configuration

Configure Claude Code for enterprise environments with proxy servers, custom Certificate Authorities (CA), and mutual Transport Layer Security (mTLS) authentication.

Claude Code supports various enterprise network and security configurations through environment variables. This includes routing traffic through corporate proxy servers, trusting custom Certificate Authorities (CA), and authenticating with mutual Transport Layer Security (mTLS) certificates for enhanced security.

Proxy configuration

Environment variables

Claude Code respects standard proxy environment variables:

# HTTPS proxy (recommended)
export HTTPS_PROXY=https://proxy.example.com:8080

# HTTP proxy (if HTTPS not available)
export HTTP_PROXY=http://proxy.example.com:8080

# Bypass proxy for specific requests - space-separated format
export NO_PROXY="localhost 192.168.1.1 example.com .example.com"
# Bypass proxy for specific requests - comma-separated format
export NO_PROXY="localhost,192.168.1.1,example.com,.example.com"
# Bypass proxy for all requests
export NO_PROXY="*"

Basic authentication

If your proxy requires basic authentication, include credentials in the proxy URL:

export HTTPS_PROXY=http://username:password@proxy.example.com:8080

Custom CA certificates

If your enterprise environment uses custom CAs for HTTPS connections (whether through a proxy or direct API access), configure Claude Code to trust them:

export NODE_EXTRA_CA_CERTS=/path/to/ca-cert.pem

mTLS authentication

For enterprise environments requiring client certificate authentication:

# Client certificate for authentication
export CLAUDE_CODE_CLIENT_CERT=/path/to/client-cert.pem

# Client private key
export CLAUDE_CODE_CLIENT_KEY=/path/to/client-key.pem

# Optional: Passphrase for encrypted private key
export CLAUDE_CODE_CLIENT_KEY_PASSPHRASE="your-passphrase"

Network access requirements

Claude Code requires access to the following URLs:

  • api.anthropic.com: Claude API endpoints
  • claude.ai: authentication for claude.ai accounts
  • platform.claude.com: authentication for Anthropic Console accounts

Ensure these URLs are allowlisted in your proxy configuration and firewall rules. This is especially important when using Claude Code in containerized or restricted network environments.

The native installer and update checks also require the following URLs. Allowlist both, since the installer and auto-updater fetch from storage.googleapis.com while plugin downloads use downloads.claude.ai. If you install Claude Code through npm or manage your own binary distribution, end users may not need access:

  • storage.googleapis.com: download bucket for the Claude Code binary and auto-updater
  • downloads.claude.ai: CDN hosting the install script, version pointers, manifests, signing keys, and plugin executables

Claude Code on the web and Code Review connect to your repositories from Anthropic-managed infrastructure. If your GitHub Enterprise Cloud organization restricts access by IP address, enable IP allow list inheritance for installed GitHub Apps. The Claude GitHub App registers its IP ranges, so enabling this setting allows access without manual configuration. To add the ranges to your allow list manually instead, or to configure other firewalls, see the Anthropic API IP addresses.

For self-hosted GitHub Enterprise Server instances behind a firewall, allowlist the same Anthropic API IP addresses so Anthropic infrastructure can reach your GHES host to clone repositories and post review comments.

Additional resources