Almost everyone who uses CC Switch to manage Claude Code and Codex has hit the same frustrating issue: you've configured your provider, but the tool keeps getting stuck in a reconnecting loop, can't connect at all, or throws a bunch of numeric error codes. The top complaints in community discussions are "CC Switch conflicts with my proxy" and "constant reconnecting." This article explains the root cause, provides an error code quick reference, fixes for lost configuration, and shows why switching to a TeamoRouter direct baseUrl connection makes most of these problems disappear.
Why CC Switch Conflicts with Your Proxy (VPN)
First, understand the mechanism: CC Switch runs a local routing process on your machine (typically listening on 127.0.0.1:some port), injecting the provider configuration you select into Claude Code/Codex's environment variables, which the CLI then uses to make requests.
The problem is two proxy layers operating simultaneously:
- Your VPN/proxy tool (Clash, Surge, V2Ray, etc.) has system proxy or TUN mode enabled, intercepting all outbound traffic from your machine;
- Requests from CC Switch's local routing process get intercepted by the proxy and forwarded a second time;
- CLI → local route → system proxy → upstream — the chain takes a detour, the handshake repeatedly fails, and you see a reconnecting loop.
A more subtle variant is TUN mode + local loopback conflict: the proxy also intercepts 127.0.0.1 traffic, so the local routing process never receives responses, creating an infinite reconnection cycle.
Root cause in one sentence: the local routing process's loopback traffic and the system-level proxy are fighting over the same route.
Solution 1: Bypass/Exempt CC Switch's Local Port
If you want to keep using CC Switch's local routing, you must make your proxy tool exempt local loopback traffic:
- Set up bypass (direct) rules in your proxy tool: Add
127.0.0.1,localhost, and CC Switch's local listening port to the "bypass proxy" list. Clash users can addIP-CIDR,127.0.0.1/32,DIRECTto the DIRECT rules. - Disable TUN mode and switch to system proxy mode: TUN mode has too broad an interception scope and is a common cause of reconnecting issues. Switching to regular system proxy mode usually stops loopback traffic from being intercepted.
- Check the "Bypass local addresses" option: Both macOS and Windows proxy settings have a "Bypass proxy server for local addresses" option — make sure it's checked.
- Ensure upstream domains go through the proxy while local loopback goes direct: The ideal chain is "CLI → local route (direct) → upstream (through proxy for internet access)." Don't let the local hop also go through the proxy.
These four steps will resolve most "conflict/reconnecting" issues. However, as long as there's a local routing process running, changes in your environment (network switch, proxy upgrade, TUN auto-enabling) can cause a relapse — which is why we recommend the direct connection solution below.
Solution 2: Error Code Quick Reference (401, 402, 502, 400, etc.)
Beyond reconnecting, CC Switch may also pass through HTTP errors from upstream. Use this table for quick diagnosis:
| Error Code | Meaning | Common Causes | Fix |
|---|---|---|---|
| 400 | Bad request | Wrong baseUrl path (missing /v1), protocol mismatch (Anthropic vs OpenAI format) |
Verify baseUrl and provider type, confirm protocol format |
| 401 | Authentication failed | Wrong API Key, expired, or copied with extra spaces | Regenerate key, re-paste (watch for leading/trailing spaces) |
| 402 | Insufficient balance | Account overdue, quota exhausted | Top up; switch to a pay-as-you-go gateway with no expiry |
| 429 | Rate limited | Too much concurrency, upstream QPM maxed out | Reduce concurrency; choose a higher-concurrency upstream |
| 500 | Upstream internal error | Abnormal account pool, broken reverse API | Usually indicates low-quality upstream — switch providers |
| 502 / 503 | Gateway/unreachable | Upstream down, node outage, proxy chain broken | Check your proxy; switch to a stable upstream |
| reconnecting (no code) | Connection repeatedly rebuilt | Local routing vs. system proxy conflict | See Solution 1 above, or switch to direct baseUrl connection |
Key takeaway: Frequent 500/502 errors are often not your configuration issue but a sign that the upstream itself is an account pool or reverse-engineered channel. Such services may be cheap but unstable — switching to a gateway that uses official API channels will fix this at the source.
Solution 3: Configuration Keeps Reverting to Flash / Settings Keep Getting Lost
Another common complaint: you set your model to Sonnet/Opus, but after a restart, it automatically reverts to flash (or the cheapest model), or your entire provider configuration "saves and then disappears."
There are typically three causes:
- Multiple processes writing to the config file simultaneously: CC Switch writes one version, the CLI writes environment variables itself, and the later write overwrites the former;
- Default routing strategy fallback: Some relay services silently downgrade to cheaper models when upstream is unavailable (this is essentially "model substitution");
- Config directory permissions / sync conflicts: Configuration stored in an iCloud/OneDrive sync directory gets overwritten by writes from different devices.
How to fix it permanently:
- In CC Switch, explicitly specify your target model — don't rely on "Auto" or "Default."
- After configuration, fully exit and restart Claude Code/Codex to ensure the new environment variables are loaded (most CLIs don't hot-reload).
- Move the config directory out of any cloud sync folder to avoid multi-device overwrites.
- If the model still gets "reverted to flash" after switching gateways, the upstream is almost certainly engaging in model substitution — you should switch providers.
The Root Fix: Connect Directly via TeamoRouter BaseUrl — No Local Routing Needed
The common root cause of all the problems above is running an extra routing process on your machine. If your gateway is 100% compatible with the Anthropic/OpenAI protocol, you can skip the local routing entirely and just set a baseUrl directly for Claude Code/Codex — no local loopback process means no proxy conflicts or reconnecting issues.
TeamoRouter is exactly this kind of LLM unified gateway, designed natively for AI agents:
- Direct baseUrl connection, zero local processes: Claude Code just needs
export ANTHROPIC_BASE_URL=...— the chain is only "CLI → (through proxy) → TeamoRouter," eliminating proxy conflicts at the source. - 100% Agent protocol compatible: Full support for Tool Calling and various Beta features — no silent failures due to missing protocol details.
- >99% cache hit rate, no model substitution: No account pool rotation, no model switching, no configuration silently reverting to flash. Combined with a 1-2x real-time floating rate, bills stay predictable.
- Enterprise-grade high availability: 99.6% SLA, up to 5000 QPM concurrency — keeps your agent running all night without dropping connections.
If you still want to use CC Switch for multi-provider management, that's perfectly fine — just add TeamoRouter as a regular provider. Setup instructions are in the CC Switch and TeamoRouter configuration guide.
Frequently Asked Questions
Will turning off my proxy fix the reconnecting issue?
It may help temporarily, but it's not a real fix — you likely still need the proxy to reach the upstream. The correct approach is to have your proxy bypass local loopback traffic (127.0.0.1) and disable TUN mode, or better yet, switch to a direct baseUrl gateway that structurally eliminates the local routing hop.
My CC Switch config keeps reverting to flash — is my provider silently switching models?
Very likely. If you've explicitly specified a model and restarted the CLI, but it still reverts to a cheaper model, the upstream is almost certainly engaging in silent downgrading (model substitution). Switch to a gateway that honors your model selection.
Which is more stable: direct baseUrl connection or CC Switch local routing?
Direct connection is more stable and hassle-free: one less local process means one less class of failure (proxy conflicts, port conflicts, reconnecting). CC Switch's value is in "one-click multi-provider switching." If you only use one or two stable upstream providers, direct baseUrl connection typically delivers a better experience.