claude doctor hangs indefinitely on api.anthropic.com health check

Description

claude doctor hangs indefinitely and never produces any output. It must be killed manually.

Environment

• Claude Code version: 2.1.181
• OS: Linux (Debian 13, kernel 6.12.90)
• Node: v22.22.3
• Auth: OAuth (claude.ai account)

Steps to reproduce

claude doctor
# hangs forever, no output on stdout or stderr

Investigation

Running claude doctor in the background while monitoring with ss -tnp shows:

1. The process clones git@github.com:anthropics/claude-plugins-official.git successfully (~2.6s)
2. It then establishes a TCP connection to api.anthropic.com (160.79.104.10:443)
3. The connection stays in ESTAB state with Recv-Q=0, Send-Q=0 — request sent, no response ever arrives
4. The process never exits and produces zero bytes of output

ESTAB 0 0  192.168.12.90:45240  160.79.104.10:443  users:(("claude",pid=XXXX,fd=20))

Confirmed: claude update works correctly and completes in ~5s. The hang is specific to claude doctor.

Expected behavior

claude doctor should either complete the health check or time out with an error message.

Actual behavior

Hangs indefinitely. Zero output on stdout or stderr. Must be killed with kill.