Most “random captcha” reports on GitHub trace back to proxy misalignment — IP says Germany while timezone says US, or WebRTC exposes your host IP. Anti-detect profiles like Multilogin isolate storage; they do not automatically fix geo consistency.
Alignment checklist
| Layer | What to match | Common leak |
|---|---|---|
| Exit IP | Target site country / city tier | Blacklisted datacenter ASN |
| Timezone | Intl + OS tz = IP geo | Host machine tz unchanged |
| Locale | Accept-Language + keyboard | en-US on non-US IP |
| WebRTC | No public host IP in ICE candidates | Real IP in STUN response |
| DNS | Resolves via proxy tunnel | System DNS bypass |
Setup workflow
- Validate proxy — curl/ipinfo through SOCKS before profile launch. Log latency and HTTP 407 auth failures.
- Bind in Multilogin — assign proxy at profile level, not per-tab override. See automation setup.
- Sync fingerprint preset — pick timezone/locale preset matching proxy country in profile template.
- Attach Playwright via CDP — do not change proxy in automation layer after profile start.
- Smoke test — one login/navigation; compare block rate before scaling concurrency.
Residential vs datacenter
Residential — better for social, e-commerce, Cloudflare-heavy consumer sites. Higher cost, rotation policies matter.
Datacenter — fine for APIs, internal SaaS, low-friction B2B when target allows. Cheaper; faster block on strict WAFs.
Related guides
FAQ
Residential vs datacenter proxy for Multilogin?
Residential IPs score better on consumer sites and captcha walls. Datacenter works for B2B dashboards with lower anti-bot friction — test both on your target.
Why captcha after changing proxy only?
Timezone or locale still reflects old geo, or WebRTC leaks real IP. Realign all identity layers, not just SOCKS endpoint.
Disclosure: MLX-MMO affiliated with Multilogin. Promo: SAAS50 / MIN50.