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Error Codes

Related blog posts, guides, and troubleshooting articles from Unknown Proxies.

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Proxy Authentication Error 2606: Causes and Fixes

Proxy Authentication Error 2606: Causes and Fixes

Proxy authentication error 2606 usually means the proxy credentials, format, IP allowlist, plan, or session settings are not being accepted.

#tutorials
#error-codes
#proxy-authentication
Cloudflare Error 1101: Worker Threw Exception

Cloudflare Error 1101: Worker Threw Exception

Cloudflare Error 1101 means a Worker threw an exception or failed to return a response. Learn causes, debugging steps, and fixes.

#tutorials
#error-codes
#cloudflare
Cloudflare Error 1033: Argo Tunnel Error

Cloudflare Error 1033: Argo Tunnel Error

Cloudflare Error 1033 means a Cloudflare Tunnel cannot be resolved because no healthy connector is available. Learn the causes and fixes.

#tutorials
#error-codes
#cloudflare
Cloudflare Error 1005: Access Denied (ASN Banned)

Cloudflare Error 1005: Access Denied (ASN Banned)

Error 1005 access denied means a Cloudflare site has blocked an ASN. Learn causes, fixes, and how it differs from 1020 and 403.

#tutorials
#error-codes
#cloudflare
Cloudflare Error 523: Origin Is Unreachable

Cloudflare Error 523: Origin Is Unreachable

Cloudflare Error 523 means Cloudflare cannot reach the origin server. Learn causes, fixes, and how it differs from Errors 521 and 522.

#tutorials
#error-codes
#cloudflare
Cloudflare Error 526: Invalid SSL Certificate

Cloudflare Error 526: Invalid SSL Certificate

Cloudflare Error 526 means Cloudflare rejected the origin SSL certificate. Learn causes, fixes, and how it differs from Error 525.

#tutorials
#error-codes
#cloudflare
#ssl
Cloudflare Error 525: SSL Handshake Failed

Cloudflare Error 525: SSL Handshake Failed

Cloudflare Error 525 means the SSL handshake between Cloudflare and the origin failed. Learn causes, fixes, and how 525 differs from 526.

#tutorials
#error-codes
#cloudflare
#ssl
Cloudflare Error 520: Web Server Returned an Unknown Error

Cloudflare Error 520: Web Server Returned an Unknown Error

Cloudflare Error 520 means the origin returned an unexpected or invalid response. Learn causes, diagnostics, fixes, and how it differs from 521 and 522.

#tutorials
#error-codes
#cloudflare
HTTP 429 Too Many Requests: How to Fix Rate Limits

HTTP 429 Too Many Requests: How to Fix Rate Limits

HTTP 429 means too many requests were sent in a short time. Learn what causes 429 errors, how to fix them, and when proxies help.

#tutorials
#error-codes
#scraping
Cloudflare Error 522: Connection Timed Out

Cloudflare Error 522: Connection Timed Out

Cloudflare Error 522 means Cloudflare could not complete a TCP connection to the origin server. Learn causes, fixes, and related Cloudflare errors.

#tutorials
#error-codes
#cloudflare
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