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Intermittent 502: Claude Code Using DeepSeek

Quick fix

The original post provides no verifiable solution. Provide the local network environment and related configuration to determine the cause.

Symptom

Section titled “Symptom”
Error output
Claude Code 到 CC Switch 已经通了，DeepSeek 配置也不是永久错误。当前故障是 CC Switch 转发 DeepSeek 时出现间歇性 502，且失败常在约 20 秒后发生，疑似 timeout、上游排队、流式连接中断或代理链路抖动。
English translation

Claude Code can already reach CC Switch, and the DeepSeek configuration is not permanently incorrect. The current failure is an intermittent 502 when CC Switch forwards DeepSeek, often after about 20 seconds. Possible causes include timeout, upstream queuing, streaming connection interruption, or proxy-chain instability.

Cause

Section titled “Cause”

The report states that Claude Code can connect to CC Switch and that the DeepSeek configuration does not fail consistently. A 502 occurs intermittently while forwarding DeepSeek, often after about 20 seconds. The report raises timeout, upstream queuing, streaming connection interruption, and proxy-chain instability as possibilities, but does not confirm a specific cause.

Fix

Section titled “Fix”

  1. The original post does not yet provide a verifiable solution. The maintainer states that the available information is insufficient to determine whether this is a local network environment issue or another cause. Add the local network environment and related configuration in the source issue, then continue following up.

Affected Versions

Section titled “Affected Versions”
ToolClaude Code
Version3.16.5（报告版本，未确认是否受影响或已修复）
PlatformsWindows

Source Issues

Section titled “Source Issues”

This page is distilled from 1 real issues

FAQ

Section titled “FAQ”

(No FAQ yet)

Section titled “Related problems”
Test failed Claude CodeCheck the actual proxy port and set the CC Switch outbound proxy to that port; in this case, changing it to 7897 restored connectivity.1 issues mergedInvalid schema for function — CodexUpgrade CC Switch to a version including the v3.18.0 fix for `parameters.type:null`; track the original issues for other `null` schema variants.13 issues mergedCodex desktop cannot see modelsSign in to official ChatGPT, enable “Keep official login when switching to third parties,” and enable local routing. Restart Codex.6 issues merged

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