Transparent ProxySG appliance reports "authentication_redirect_to_virtual_host DENIED" error message in Access Logs

Products

• ProxySG Software - SGOS

Issue/Introduction

All users fail to authenticate in a transparent proxy. An "authentication_redirect_to_virtual_host DENIED" message can be seen from the Access Logs.

Resolution

1. Ensure the HTTPS Reverse Proxy service for the virtual URL is intercepted explicitly. This service must exclusively listen for virtual URL authentication requests.
2. Ensure there's no policy rule denying explicit traffic. Transparent authentication is performed via explicit connection, as you are directing the transparent user to authenticate via the ProxySG appliance.

The following KB article describes step by step how to setup transparent SSL Forward proxy with authentication:
Configure Transparent SSL forward proxy with authentication