Network & proxy errors
Proxy, TLS, DNS, and timeout failures reaching the API behind firewalls.
2176 related issues · 381 open · 1795 resolved · peaked at 444 open (2026-08)
Backlog trend over time
The line shows how many issues in this topic were open at the end of each month, derived by
counting each issue from its creation date until it was closed. First-party data from the
anthropics/claude-code tracker.
All network & proxy errors issues
Ranked by community engagement (reactions and comments).
- CC v2.1.100+ inflates cache_creation by ~20K tokens vs v2.1.98 — same payload, server-side
- [FEATURE] Secure secrets injection for Claude Code on the web
- [BUG] API Error: Connection closed mid-response ==> frequent enough to make Claude Code unusable for any task
- Claude Code OAuth login fails with a timeout error. `auth.anthropic.com` does not resolve via DNS, making it impossible to authenticate.
- [BUG] Remote Control sessions die after ~20 min idle — server TTL ignores keepalives
- [BUG]Cowork network egress allowlist not working - custom domains blocked with 403 blocked-by-allowlist
- [BUG] macOS sandbox blocks Security.framework TLS verification, breaking Go binaries (gh, terraform, etc.)
- Go-based CLI tools (gh, terraform, etc.) fail with TLS error due to built-in HTTPS proxy
- Inter-session communication for multi-Claude workflows
- [BUG] Native Windows(Powershell) install of Claude Code is not viable
- [FEATURE] Support OpenTelemetry (OTel) configuration in Claude Code on the Web (claude.ai/code)
- [BUG] Freshly installed Claude Code ignores settings.json
- [BUG] sandbox: SOCKS5 proxy requires authentication that BSD nc cannot negotiate, breaking SSH git operations
- [BUG] Anthropic embedded spyware in Claude Code
- [Bug] Regression: malware reminder on every Read still causes subagent refusals in v2.1.111 (fix from #47027 / v2.1.92 did not hold)
- MCP claude.ai Microsoft 365 connector rejects personal Microsoft accounts (Hotmail/Outlook.com/Live)
- Sandbox blocks Go TLS cert verification on macOS (gh CLI fails)
- [BUG] Cowork — "Additional allowed domains" allowlist non-functional
- [FEATURE] Add native GitHub Issues integration for reading and implementing issues
- Grep and Glob tools missing entirely from registry under ENABLE_TOOL_SEARCH=true
- [BUG] Reopening of Claude Desktop Installation Fails on Windows 11 - Signature Verification & Unable to Load #25385
- [BUG] Claude Code on the Web .NET SDK binary downloads blocked by proxy even with "All domains" network access enabled
- 503 upstream connect error or disconnect/reset before...
- [Feature] Cowork desktop app: support host proxy settings (HTTP/HTTPS/NTLM) for enterprise network environments
- [BUG] Cloud/Cowork sessions: git proxy now blocks all pushes — "not in this session's authorized repository set"; PAT pass-through no longer works (CCR_TEST_GITPROXY rollout?)
- [BUG] Native Claude Code not using system certs on MacOS
- [BUG] ECONNRESET errors - Unable to connect to API despite healthy network
- Request: Custom Claude API Endpoint Support
- [BUG] Adding marketplace with custom SSH git url is not allowed
- [BUG] /login leads to invalid IP Address
- [BUG] Cowork macOS: MITM egress proxy blocks all non-API domains regardless of allowlist settings
- [BUG] Allow network egress - All domains' setting not reflected in session proxy JWT
- [BUG] Cowork Dispatch not responding on macOS
- JANUARY 20th: Claude Code Web/Mobile: "Repository or branches not found" — persistent 404 on git_proxy endpoint
- [DOCS/BUG] Browser automation tools (Playwright/Puppeteer) incompatible with web sandbox proxy
- [BUG] Interactive CLI degrades over time, leading to UI lag and repeated timeout errors
- [ENHANCEMENT] [FOLLOW-UP] MCP notifications/message Support - Claude Code Receives But Doesn't Display Messages
- [BUG] [Cowork] sandbox.network.allowedDomains ignored — external APIs blocked (api.zotero.org, crossref.org, etc.)
- [BUG] Claude Cowork — "Self-signed certificate detected" on macOS with no proxy
- [BUG] Claude stuck at 0 tokens
- [BUG] MCP roots capability advertised but roots/list method not implemented
- Allow pushing to the task-assigned branch, not just claude/* branches
- [BUG] Built-in browser ignores Allowed sites for internal hostnames (*.habifino.local): "Site-level permissions are disabled for this site", prompt on every action
- [BUG] Claude Code on the Web: Gradle wrapper fails to download distribution - Java doesn't honor https_proxy
- Add rate limit data to statusline JSON input
- [BUG] CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS doesn't remove ?beta=true query params and anthropic-beta headers
- CLI mutates historical tool results via cch= billing hash substitution, permanently breaking prompt cache
- Feature Request: Add Hook for Tool Execution Failures (`OnToolError` / `ToolUseFailure`)
- [FEATURE] Be Able to Add a OAuth-Compliant Credential Manager for Claude Connectors
- [Bug] Anthropic API Error: 503 Upstream Connection Reset
- [Bug] v2.1.117 regression: parallel Bash tool calls corrupt fd 3 in nested-Docker sandbox; permanent /proc/self/fd/3: Permission denied
- [BUG] MCP OAuth Integration Fails on Production Deployments with step=start_error
- [BUG] Claude Code Proxy Issue: Private NPM Package Authentication Failure
- [BUG] Cowork Windows: API unreachable from VM behind corporate NTLM proxy (cntlm)
- Cowork sessions fail with 'Connection error' - internal MITM proxy blocking api.anthropic.com
- Agent Teams: Spawned teammates don't inherit model configuration from team lead
- Agent SDK subagents have prompt caching disabled by default (enablePromptCaching: false)
- [BUG] Bash tool fails with zsh + zoxide configuration - "__zoxide_z not found" errors
- Voice mode: "Connection closed: code 1006" on Linux
- [BUG] Cowork cloud sandbox: egress allowlist collapses to ~5 hosts despite account setting "All domains"
- [BUG] Can't specify OAuth scope for Snowflake MCP
- Fix: Claude Code 403 "Request not allowed" on macOS with Proxy/VPN (China & Region-restricted Areas)
- [BUG] Resume/continue cache invalidation
- [BUG] When context remaining is less than 10% (i.e. 70% usage), Claude Code stops working with an API timeout error.
- [BUG] /install-github-app does not allow to authenticate when running from container
- Channels 'not currently available' on Teams plan despite admin enablement
- [BUG]
- [BUG] Atlassian MCP Server Tools Not Available in Claude Code 2.0.10 Conversations Despite Successful Connection
- Gateway model discovery never fires when using apiKeyHelper (works with ANTHROPIC_AUTH_TOKEN)
- [FEATURE] Remote Control: allow localhost proxies (loopback exception or opt-in for ANTHROPIC_BASE_URL=http://127.0.0.1:*)
- [BUG] MCP tool calls in CCR Routines fail with "requires approval" — no approval UI shown, reconnect does not resolve
- [BUG] Archived Code session cannot be unarchived - equivalent to permanent deletion
- OAuth token expired immediately after fresh login - cannot use Claude Code (blocking)
- API Error: Connection refused — a firewall or proxy may be blocking it (ConnectionRefused)
- [BUG] Claude Code web session loses GitHub push access mid-project
- [BUG] Auto Mode sends unsupported "afk-mode-2026-01-31" beta header causing API 400 error
- [BUG] Native binary installation ignores HTTP_PROXY for API streaming requests (Bun fetch issue ?)
- [BUG] WSL: "Unable to connect to Anthropic services" resolved by disabling telemetry
- [BUG] Magic-link login returns “can’t verify email” error on desktop app and web — distinct from onboarding redirect issues, 1+ month unresolved
- [BUG] /compact fails with cyber safeguards false positive during legitimate defensive security session
- [BUG] Claude Code changes model identifier mid-conversation on AWS Bedrock (eu to us region)
- Claude Desktop 3p + custom gateway (`ANTHROPIC_BASE_URL`): sandbox network pinned to gateway + api.anthropic.com, `sandbox.network.allowedDomains` ignored even after full app restart
- [BUG] Browser pane blocks same-origin subresources with ERR_BLOCKED_BY_CLIENT for local dev domains mapped to 127.0.0.1 via /etc/hosts — page renders blank
- Cowork cloud sessions cannot access any GitHub repository, and the git proxy instructs the agent to call a nonexistent add_repo tool
- [BUG] Homebrew version rollback
- Remote Control: Frequent disconnections every 20-60 min on v2.1.71 (was stable 24h+ on prior versions)
- [BUG] Cowork ECONNRESET on macOS - Unable to connect to API (Max plan)
- [BUG] Cowork Windows - VM boots but cannot reach Claude API (Windows 10 Pro, Hyper-V)
- [Bug] Anthropic API Error: Repeated 503 Upstream Connection Resets - FIX YOUR ***
- [Bug] Incorrect Session Summaries with Cross-Contaminated Metadata
- [BUG] Intermittent ECONNRESET on both desktop app and standalone CLI, no VPN/proxy
- Claude Desktop update breaks LAN SSH/network access (OPERON_SANDBOXED_NETWORK=1)
- Bug: HTTP MCP client ignores no_proxy environment variable
- [BUG] Local MCP server will not trust self-signed certs
- i use mac,and in support country; but input "claude" reprot Unable to connect to Anthropic services;
- Claude Desktop Task mode: "Failed to create bridge sockets after 5 attempts" on macOS 26.4
- [BUG] Builtins Subagents use hardcoded model names
- Browser tool can't verify local HTTPS dev servers (self-signed cert + non-rendering pane block all workarounds)
- [Bug] Ink renderer crashes in spawned teammate agents during tmux mode sessions
- Bedrock streaming: undefined is not an object (evaluating '_.speed')
- [BUG] 2.1.69 sends advanced-tool-use-2025-11-20 beta flag that Bedrock/LiteLLM rejects (regression from 2.1.68)
- Network Timeout Errors Occurring Frequently in API Calls
- [BUG] Connection-level errors (ECONNRESET, EPIPE, ETIMEDOUT) are never retried — immediate failure with zero recovery
- [BUG] Remote Connection / Mobile App
- [Bug] Session token limit reached prematurely after upgrade to v2.0.64
- [BUG] Cost not calculated for LLM Gateway interactions
- sandbox.excludedCommands has no effect — excluded commands still run sandboxed (2.1.232, macOS)
- [BUG] Workflow-tool agent() subagents omit x-claude-code-agent-id / parent-agent-id (Task subagents are tagged)
- [BUG] HTTPS_PROXY is not applied to the Anthropic API POST requests when set in ~/.claude/settings.json
- [BUG] --resume loses [1m] context window on non-first-party ANTHROPIC_BASE_URL when session model differs from default
- Streamable-HTTP MCP connector: 405 on SSE GET surfaces fatal "Client server capabilities not available" toast
- Cowork 'Failed to create bridge sockets' error on session resume (allowedDomains=0)
- DNS resolution fails in Claude Code Web VM even with Full network access
- [BUG] Claude CLI fails to connect to VSCode IDE on macOS 15.5
- Add HTTP Proxy support
- Egress allowlist ignores "All domains": every host outside a built-in list gets 403 on CONNECT (regression 2026-09-10 -> 2026-09-11)
- [BUG] NODE_EXTRA_CA_CERTS is not effective when set in ~/.claude/settings.json
- sandbox.excludedCommands has no effect: listed commands still run sandboxed
- Persistent HTTP 429 on auto-mode classifier (xml_s1), account-side config
- [BUG] Sandbox git proxy rejects git push updates to existing main with HTTP 403
- [BUG] SSH connection fails after 2.xupdate — password-auth fallback no longer triggered
- [BUG] NO_PROXY stopped working in 2.1.23
- Systematic Service Failures - $440 Refund Request After Month of Critical Bugs (WSL2)
- [Bug] Connection Failure: 503 Error Preventing CLI Startup
- [BUG] Persistent ECONNRESET / "Connection lost mid-response" on all Code surfaces while raw HTTPS to api.anthropic.com is healthy (Windows 11, v2.1.229)
- [BUG] Auth token and base URL wiped after navigating to agents panel and back
- [BUG] v2.1.121: CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS=1 + Opus 4.7 causes 401 "OAuth authentication is currently not supported" retry-loop
- [BUG] v2.1.113+ on linux-x64 behind HTTP CONNECT proxy: Bun runtime fetch race condition + 3 cascading regressions
- MCP OAuth dialog stuck: 'Hit Enter to continue' doesn't accept Enter key
- [BUG] Claude Code sends SIGTERM to all healthy stdio MCP servers after 10-60s — root cause analysis with strace evidence
- [BUG] Claude Code Web: crates.io blocked by proxy in cloud environment despite being trusted by default
- [BUG] Native installation / binary return API errors
- [Report] File path completion may fail unless USE_BUILTIN_RIPGREP is enabled
- [BUG] git push of tags fails with 403 from Claude Code cloud session, despite full GitHub App permissions and no repo protections
- `API Error: The socket connection was closed unexpectedly` — packet captures show server-initiated FIN mid-stream (10 incidents, requestIds included)
- [BUG] Cowork macOS: all claude.ai-hosted MCP connectors fail — desktop OAuth token requested without `user:mcp_servers` scope
- [BUG] Mid-session silent hang (10-20 min) between sequential tool calls on Linux 2.1.143
- [BUG] Cowork Windows: WebFetch egress proxy blocks all domains regardless of "All domains" allowlist setting
- [BUG] Loading claude-code VSCode extension on firefox 149.0-1 does not load styles correctly
- Model ignores CLAUDE.md rules, makes unverified claims, reports false success
- [BUG] SSL certificate configuration don't work with web page `Fetch` (but works with MCP)
- [BUG] Desktop Code tab ignores ANTHROPIC_BASE_URL from ~/.claude/settings.json (terminal CLI honors it)
- [BUG] 2.1.278: a file redirection on a single excluded command defeats sandbox.excludedCommands (gh fails TLS)
- [BUG] Support HTTPS proxy (https:// scheme) for HTTPS_PROXY environment variable
- [FEATURE] Expose allowGitConfig from sandbox-runtime in settings schema
- OAuth callback fails in devcontainers: server binds to IPv6 (::1) but VS Code port forwarding connects via IPv4
- [BUG] Max 20x: Usage meter climbing abnormally fast since ~March 23 — 1-2% per simple message exchange
- [BUG] Cowork Windows — hvsock dies after idle, "connection aborted by software in host machine" (Win 11 Pro 24H2)
- [FEATURE] Browser view / browser tools in Claude Code cloud sessions (Claude Code on the web)
- [Bug] Anthropic API Error: Usage Policy violation on non-policy-violating prompts
- [BUG] Claude Code on the Web: Git LFS not supported — proxy rejects LFS batch API with "invalid git path"
- [BUG] Claude should not clone claude-plugins-official.git with SSH
- [BUG] OAuth login fails with ERR_INVALID_IP_ADDRESS behind corporate proxy (regression since 2.0.37)
- Using the Proxy results in a 404
- [BUG] Notion MCP connector (both project .mcp.json and claude.ai OAuth connector) triggers 400 input_schema oneOf/allOf/anyOf error in interactive main loop
- Remote Control: mobile app crashes/closes immediately when tapping an online session (iOS 26.5 / iPhone 15 Pro, host CLI 2.1.186 Win11)
- [BUG] Claude code can no longer be installed or updated using native installer on IPV6-only networks
- [BUG] CLI 2.1.145 sends literal "claude-opus-4-7[1m]" as model name on session resume, hits 404, silently falls back to 200K
- [BUG] Chrome extension reconnect fails due to CSP blocking inline script on claude.ai
- [BUG] Can't use claude behind tunnel proxy
- [BUG] Desktop app Browser pane: read tools blocked with "requires per-action approval" even though domain is in launchPreviewAllowedOrigins, restart does not clear it
- [BUG] API ignores explicit thinking display:"summarized" for Opus 4.8 / Sonnet 5 since 2026-07-16 — empty thinking blocks; server-side (request verified delivered)
- [BUG] 2.1.19x native CLI: OAuth login fails CERT_HAS_EXPIRED on claude.com / platform.claude.com (no proxy) — bundled Bun 1.4.0 regression vs 1.3.14
- [BUG] Routine push to main returns HTTP 403 from git proxy despite "Allow unrestricted branch pushes" being enabled
- Sandbox blocks macOS Security.framework trustd IPC, breaking all Go binaries (gh, terraform, tofu)
- [BUG] Feature flag tengu_claudeai_mcp_connectors pushed server-side without consent
- [Bug] Egress proxy blocks GitHub subdomains, breaking git operations in web bash environment
- Constantly receiving API ERROR 503
- [BUG] - Unable to connect to Anthropic services - behind corporate proxy
- [BUG] Cowork (macOS): all outbound egress lost mid-session from BOTH the desktop workspace and the cloud container; file access unaffected
- [Cloud sessions] Regression between 2026-06-18 and 2026-06-25: GitHub REST passthrough returns 403 "GitHub access is not enabled for this session" for org repos despite Claude GitHub App installed
- Feature request: allow Remote Control when ANTHROPIC_BASE_URL is a transparent local proxy to api.anthropic.com
- CERT_HAS_EXPIRED on Windows native install during OAuth login, no proxy/VPN/AV — curl succeeds on same host
- Opus 4.7 on Bedrock fails with "invalid beta flag" - Claude Code sends unsupported beta headers
- [BUG] Oauth Error - stuck, massive workload, can't log in :(
- [BUG] Claude Desktop Code/Cowork mode returns 403 "Request not allowed" while CLI and Chat work fine
- [Bug] Anthropic API Error: Internal Server Error (500)
- WebFetch tool fails with SSL error behind Zscaler/corporate proxy (Bun runtime ignores NODE_EXTRA_CA_CERTS)
- [BUG] Verified Evidence: Claude Code Delivers 10% of Requested Thinking Budget While Charging Full Price
- Bug: Multi-Session Hang - Only Latest CLI Session Works (WSL2 + OAuth)
- Claud e Code (Claude Pro - sonnet 4.0) – Unusable Deployment Output After 6 Weeks of Development - next.js + ghost cms
- [BUG] Unable to connect to MCP Server when using HTTP PROXY.
- [BUG] Windows: Atlassian Remote MCP Server fails to connect
- [BUG] API Error (Request timed out) in Remote SSH Dev Container on Linux Host
- Claude Code does not handle new OAuth after archiving workspace
- [BUG] GitHub proxy 403s release-asset downloads in cloud sessions, breaking builds
- [BUG] GitHub push permission (403) in Claude Code Remote session - read only despite repo being added as source
- [BUG] False "check your network" timeout error during long Opus 4.8 processing in /advisor mode
- MCP HTTP-Streamable Server: Init-Handshake fails on reconnect
- Claude Code web sandbox proxy allowlist blocks user-owned custom domains
- [Bug] Claude silently ends turn on Edit tool failure instead of retrying or continuing plan
- [BUG] ssh ProxyCommand not working on claude desktop code tab on windows, ProxyJump not supported on windows or Mac
- Remote Control: Dispatch stuck on "Brewing..." - no response from spawn session (Windows 11)
- [BUG] ECONNRESET on corporate network - TLS fingerprinting blocks Bun while curl/Node.js work
- VS Code extension ignores proxy settings from ~/.claude/settings.json and environment variables
- [BUG] Claude Code + Cowork fail with ECONNRESET on every network and client — chat works fine
- claude --cloud always creates a bundled session (no remote, no push) despite completed /web-setup and repo-bound web UI
- [BUG] SSL certificate has expired not working since 2.1.190+ on mac
- [BUG] Claude Code on the Web: Git LFS not supported — proxy rejects LFS batch API with "invalid git path"
- [BUG] Claude Code on the Web: Git LFS not supported — proxy rejects LFS batch API with "invalid git path"