Add private-address failure mode to self-hosted MCP troubleshooting - #1070
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The self-hosted networking section predated the AI_AGENT_MCP_ALLOW_PRIVATE_ADDRESSES env var shipped in 0.3234.0, so it was missing the third failure mode: MCP endpoints that resolve to private IPs are blocked by default with "MCP servers must use a public URL". Adds the error to the troubleshooting table with a link to the env-vars reference. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Uw5xueaZQbYnZUQ1iVkYyH
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Follow-up to #886, which was drafted before
AI_AGENT_MCP_ALLOW_PRIVATE_ADDRESSESshipped in 0.3234.0 (lightdash/lightdash#24660) and so missed the third self-hosted failure mode.Adds the "MCP servers must use a public URL" error to the troubleshooting table — endpoints resolving to private/internal IPs are blocked by default as an SSRF safeguard — pointing self-hosted operators at
AI_AGENT_MCP_ALLOW_PRIVATE_ADDRESSES=truein the env-vars reference. Also mentions the flag in the internal-endpoints setup bullet, since internal hostnames typically resolve to private IPs and hit this error right after DNS is fixed.Error string and env var verified against
packages/backend/src/utils/ssrfProtection.tsandparseConfig.ts.Linear: PROD-8453
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https://claude.ai/code/session_01Uw5xueaZQbYnZUQ1iVkYyH