407 on every request
Likely causes
- - page.authenticate not called
- - Credentials URL-encoded incorrectly
Verified remedy
Call page.authenticate({ username, password }) with dashboard values; URL-encode special characters.
Proxy troubleshooting
Fix puppeteer proxy 407
Ranked causes, ordered diagnostics, and a verified remedy for puppeteer proxy 407 - ending with a final connection check.
Quick answer
Fix: Puppeteer headless 407 from the proxy. Confirm endpoint values, test with curl through the endpoint, apply the matched remedy, then re-verify the exit IP is your assigned endpoint.
Exact symptom text
Causes ranked by likelihood
Ordered diagnostics
Final connection check
When this is the right fit
- Exact symptom text
- Causes ranked by likelihood
- Ordered diagnostics
Who this page is for
Ranked causes, ordered diagnostics, and a verified remedy for puppeteer proxy 407 - ending with a final connection check.
Fix: Puppeteer headless 407 from the proxy. Confirm endpoint values, test with curl through the endpoint, apply the matched remedy, then re-verify the exit IP is your assigned endpoint.
Diagnosis tree
407 only on some frames
Likely causes
- - Requests from service workers skip authentication
- - Interception reorders handlers
Verified remedy
Enable request interception early and authenticate before navigation.
Final connection check
- 1Apply the remedy for the matched symptom
- 2Test the endpoint directly with curl -x or --socks5-hostname
- 3Repeat the original action in the tool
- 4Confirm the exit IP is the assigned endpoint
Working connection
The original action completes and the exit IP matches the endpoint.
Broken connection
If curl through the endpoint also fails, the problem is endpoint-level: check dashboard status or swap to a spare endpoint.
Sources
Facts last reviewed 2026-09-01.
Prevent it recurring
Chromium's --proxy-server argument never carries credentials; page.authenticate is required.
195+ countries
99.9% uptime guarantee
Unlimited bandwidth
4.9/5 from 127 ratings
Frequently asked questions
How do I fix puppeteer proxy 407?
Work the diagnosis tree top to bottom: confirm endpoint values, test with curl through the endpoint, apply the remedy, then run the final connection check.
Why does this keep coming back?
Recurring proxy failures usually trace to an unstable mapping - rotating endpoints or shared addresses. A dedicated static endpoint per profile makes behavior predictable.
Choose one stable proxy for every active profile
Buy self-serve now, or talk with us about a larger agency inventory.