401 Unauthorized: Running portal behind an APACHE reverse proxy

Hello to all,

we've got following scenario:

www <-HTTPS-> APACHE (external SSL termination) <-HTTPS-> portal

If I call the internal URL (https://backend.xy.de:443/irj/portal) of the portal,

I'll be redirected to the logon servlet and logon to the portal application is possible.

Now we set up a APACHE reverse proxy in oder to access the portal from internet.

I've set up a virtual host:

<VirtualHost test.xy.de:443>     <Location />          ProxyPass https://backend.xy.de:443/        ProxyPassReverse /     </Location></VirtualHost test.xy.de:443>

But now if I call the portal application https://test.xy.de/irj/portal I get the following error:

Unauthorized
This server could not verify that you are authorized to access the document requested. Either you supplied the wrong credentials (e.g., bad password), or your browser doesn't understand how to supply the credentials required.

Any idea how to fix this?

Regards Christian