Getting 407? Here’s why it happens and the exact fix.
You are seeing 407 because the proxy gateway rejected your credentials. The fix: verify your username:password pair or IP allowlist entry in the KnoxProxy dashboard.
Log in to dashboard.knoxproxy.com, navigate to API Keys, and copy your current username and password.
Run: curl -x http://USER:PASS@gw.knoxproxy.com:7000 https://httpbin.org/ip to verify credentials work outside your application.
If using IP allowlist, verify your server IP matches the dashboard. If your server IP changed (dynamic hosting), add the new IP or switch to user:pass auth.
Verify your account is active and has available balance. A zero-balance account returns 407 on all requests.
import requests
import os
# Credentials from environment variables (set from dashboard values)
user = os.environ["KNOX_USER"]
password = os.environ["KNOX_PASS"]
proxy = f"http://{user}:{password}@gw.knoxproxy.com:7000"
r = requests.get("https://httpbin.org/ip",
proxies={"https": proxy})
print(r.status_code) # 200 OK
print(r.json()) # {"origin": "residential-ip"}Test your setup with our proxy checker, then contact support if 407 still won’t clear.
A 407 Proxy Authentication Required response comes from the proxy server itself, not the target website. The proxy gateway is saying it does not recognize your credentials. This is a client-side configuration issue -- your proxy username, password, or IP allowlist is wrong.
Use the exact credentials from your dashboard. Watch for trailing spaces, wrong case, or URL-encoded special characters.
Add your current public IP to the allowlist in the KnoxProxy dashboard. If your IP is dynamic, switch to user:pass authentication.
Resolve any billing issues and generate a new API key if the old one was revoked.
If your credentials are correct and account is active but 407 persists, check if your ISP or firewall is intercepting the proxy connection. Try from a different network. Contact KnoxProxy support with your account email and the exact proxy endpoint you are connecting to.
A 407 always comes from the proxy gateway, never from the target. It means the proxy did not recognize your credentials. Check your username, password, and account status.
Common causes: account balance hit zero, API key was rotated, or your server IP changed while using IP-allowlist auth. Check your dashboard for each.
Yes. Use curl -x http://USER:PASS@gw.knoxproxy.com:7000 https://httpbin.org/ip. If this returns your proxy IP, credentials are valid.
KnoxProxy comes pre-configured to avoid the most common errors. Start a free trial and fix 407 for good.