95 lines
3.3 KiB
Markdown
95 lines
3.3 KiB
Markdown
# OpenAI/ChatGPT Proxy Endpoint Probe Notes — 2026-05-08
|
||
|
||
## Context
|
||
|
||
During Codex/OpenAI OAuth prerequisite testing, BOSS asked to verify direct browser access and then explicit LAN proxy endpoints:
|
||
|
||
- `socks5://192.168.2.8:1085` (tested as `socks5h://` so DNS resolves through proxy)
|
||
- `http://192.168.2.8:1084`
|
||
|
||
The Mac had local IP `192.168.2.69/24`, default route via `192.168.2.8`, and an ARP entry for `192.168.2.8`, but ICMP/TCP to the gateway/proxy endpoint failed.
|
||
|
||
## Observed failure signatures
|
||
|
||
System/browser without working proxy:
|
||
|
||
```text
|
||
chatgpt.com -> polluted IPs such as 202.160.128.16 / 199.59.150.40 / 2a03:2880:...
|
||
accounts.openai.com -> polluted IPs such as 192.133.77.189 / 128.121.146.109 / 2a03:2880:...
|
||
Chrome: ERR_CONNECTION_CLOSED
|
||
curl: LibreSSL SSL_connect: SSL_ERROR_SYSCALL
|
||
```
|
||
|
||
Explicit SOCKS5/HTTP proxy endpoint unavailable:
|
||
|
||
```text
|
||
ping 192.168.2.8 -> sendto: No route to host / 100% packet loss
|
||
nc -vz -w 5 192.168.2.8 1085 -> No route to host
|
||
curl --proxy socks5h://192.168.2.8:1085 https://chatgpt.com/ -> Failed to connect
|
||
nc -vz -w 3 192.168.2.8 1084 -> No route to host
|
||
curl --proxy http://192.168.2.8:1084 https://chatgpt.com/ -> Failed to connect
|
||
```
|
||
|
||
Route/ARP could still look superficially valid:
|
||
|
||
```text
|
||
default gateway: 192.168.2.8
|
||
192.168.2.8 at <mac> on en0 ifscope
|
||
local IP: 192.168.2.69
|
||
```
|
||
|
||
Do not mistake this for a ChatGPT/OpenAI auth bug or extension bug. If the LAN proxy endpoint itself is unreachable, browser automation and OAuth should stop.
|
||
|
||
## Recommended probe order
|
||
|
||
1. Flush DNS cache only as a low-risk refresh:
|
||
|
||
```bash
|
||
dscacheutil -flushcache || true
|
||
killall -HUP mDNSResponder 2>/dev/null || true
|
||
```
|
||
|
||
2. Check current DNS and detect pollution:
|
||
|
||
```bash
|
||
python3 - <<'PY'
|
||
import socket
|
||
for host in ['chatgpt.com','accounts.openai.com','auth.openai.com','openai.com']:
|
||
try:
|
||
print(host, sorted({x[4][0] for x in socket.getaddrinfo(host,443,proto=socket.IPPROTO_TCP)}))
|
||
except Exception as e:
|
||
print(host, 'ERR', e)
|
||
PY
|
||
```
|
||
|
||
3. Test gateway and proxy endpoint before browser tests:
|
||
|
||
```bash
|
||
ping -c 2 -W 1000 192.168.2.8 || true
|
||
nc -vz -w 5 192.168.2.8 1085 || true
|
||
nc -vz -w 5 192.168.2.8 1084 || true
|
||
```
|
||
|
||
4. For SOCKS5, use `socks5h://` in curl so DNS is performed through the proxy:
|
||
|
||
```bash
|
||
curl --proxy socks5h://192.168.2.8:1085 -I -L --max-time 30 https://chatgpt.com/
|
||
curl --proxy socks5h://192.168.2.8:1085 --max-time 20 https://api.ipify.org
|
||
```
|
||
|
||
5. For HTTP proxy:
|
||
|
||
```bash
|
||
curl --proxy http://192.168.2.8:1084 -I -L --max-time 30 https://chatgpt.com/
|
||
curl --proxy http://192.168.2.8:1084 --max-time 20 https://api.ipify.org
|
||
```
|
||
|
||
6. Only launch a proxied browser or extension run after at least one proxy endpoint succeeds.
|
||
|
||
## Interpretation
|
||
|
||
- `No route to host` to the proxy IP/port means the local Mac cannot reach the LAN proxy service. Fix LAN/gateway/firewall/Wi‑Fi/VLAN/router first.
|
||
- `Connection refused` means the host is reachable but no service is listening on that port or firewall actively rejects it.
|
||
- HTTP 200/30x/403 Cloudflare challenge through the proxy is better than transport failure; browser testing can proceed, but CAPTCHA/security challenge may still require manual action.
|
||
- Polluted system DNS may remain even while explicit `socks5h://` works; in that case use browser `--proxy-server=socks5://...` or ensure PassWall2 DNS hijack/remote DNS is correctly applied.
|