Stale ANTHROPIC_BASE_URL Produces Misleading Connection-Refused Error
When a stale ANTHROPIC_BASE_URL environment variable points to a dead local endpoint, Claude Code fails instantly with a generic connection-refused error, while standard diagnostics like curl and raw fetch succeed because they don't read that variable, leaving users no clear diagnostic path to the true root cause.
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Problem descriptions, scores, analysis, and solution blueprints may be updated as new community data becomes available.