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All Error Catalog

Error 400Bad Request Error 401Unauthorized Access Error 403Access Denied / Forbidden Error 404Page or Tunnel Not Found Error 1015You are being rate limited Error 500Internal Server Error Error 502Bad Gateway Error 503Service Temporarily Unavailable Error 504Gateway Time-out Error 521Web server is down Error 522Connection timed out Error 524A timeout occurred Error 1003Direct IP access not allowed Error 1016Origin DNS error Error 1020Access denied Error 1033Argo / APNC Tunnel error

Web server is down

Error code 521

The origin web server refused the connection from the Edge Tunnel.
Host: error.apyrentic.com • Ray ID: 6421bec26c6a6e41 • 2026-10-26 03:45:11 UTC

✓

You

Browser

Working

✓

Tokyo Edge Gateway

APYRENTIC / APNC Edge

Working

✕

error.apyrentic.com

Host / Tunnel Origin

Error

What happened?

The tunnel client (frpc) is online, but the local port on the origin server is closed (Connection Refused).

What can I do?

Start your local web application on the origin server and refresh this page.