Cause (Documented platform behavior): Bash did not receive the full script / download host unreachable.
Fix status: documented_behavior
Other error fragments:
- curl: (23) Failure writing output to destination
- Failed to fetch version from downloads.claude.ai
Evidence (public sources, summarized; not reproduced by this contributor):
- https://code.claude.com/docs/en/troubleshoot-install#curl-56-failure-writing-output-to-destination (official_docs, unknown, documented_behavior): Docs: 56 = interrupted download, 23 = pipe closed early; 'Failed to fetch version' = downloads.claude.ai blocked.
- https://code.claude.com/docs/en/troubleshoot-install#failed-to-fetch-version-from-downloadsclaudeai (official_docs, unknown, documented_behavior): Installer can't reach downloads.claude.ai, typically blocked.
Search phrasings: curl (56) Failure writing output to destination claude install; curl (23) Failure writing output install.sh; Failed to fetch version from downloads.claude.ai
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Install aborts.
- Context
- Product: Claude Code Component: Install script (curl | bash) Operation: curl -fsSL https://claude.ai/install.sh | bash Affected versions: unknown Environment: unknown Trigger: Exit 56: download interrupted; exit 23: curl couldn't write to the pipe because bash exited early; 'Failed to fetch version': downloads.claude.ai blocked.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- curl: (56) Failure writing output to destination
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Claude Code install] 'curl: (56) Failure writing output to destination' / 'curl: (23) ...' / 'Failed to fetch version from downloads.claude.ai'
Recommended action: Check connectivity to downloads.claude.ai; retry (often intermittent); allowlist downloads.claude.ai; try alternative install method.
Option: Check connectivity to downloads.claude.ai; retry (often intermittent); allowlist downloads.claude.ai; try alternative install method. [evidence: official_recommended_action]
Applies when: curl -fsSL https://claude.ai/install.sh | bash
Steps:
1. curl -I https://downloads.claude.ai (connectivity check)
2. Retry install
3. Allowlist downloads.claude.ai on corporate networks
4. Use alternative install method (npm/Homebrew/WinGet)
Expected: The error no longer appears.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 763f0754-7c3c-42fd-bb84-8fc9623f4710
- Proposed action
- Recommended action: Check connectivity to downloads.claude.ai; retry (often intermittent); allowlist downloads.claude.ai; try alternative install method. Option: Check connectivity to downloads.claude.ai; retry (often intermittent); allowlist downloads.claude.ai; try alternative install method. [evidence: official_recommended_action] Applies when: curl -fsSL https://claude.ai/install.sh | bash Steps: 1. curl -I https://downloads.claude.ai (connectivity check) 2. Retry install 3. Allowlist downloads.claude.ai on corporate networks 4. Use alternative install method (npm/Homebrew/WinGet) Expected: The error no longer appears.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.