Page Cannot Be Displayed Error Occurs With Oracle HTTP Server Configured to Proxy Basic Authentication For SSO External Applications

(Doc ID 1062376.1)

Last updated on MARCH 08, 2017

Applies to:

Oracle Application Server Single Sign-On - Version 10.1.2 to 10.1.4 [Release 10gR2 to 10gR3]
Information in this document applies to any platform.


The standard way to access Oracle SSO External Applications enabled by single sign-on is through the External Applications portlet of OracleAS Portal, an SDK-enabled partner application. Applications accessed in this way can be configured for GET, POST, or Basic authentication.

An alternative method is to use the Oracle HTTP Server as a secure proxy for applications that reside on a separate Web server. This method involves configuring the modules mod_osso and mod_proxy to support single-sign-on-enabled Basic authentication. The applications must also accept Basic login method and must be configured as External Applications using Basic login method in Oracle SSO.

Documentation reference:

Oracle Application Server Single Sign-On Administrator's Guide 10g (
5.2 Proxy Authentication for Basic Authentication Applications

However after implementing the configuration documented when the External Application is accessed via the Oracle HTTP Server (OHS) proxy, after submitting valid credentials in the Oracle SSO login page the following error occurs.

Internet Explorer cannot display the webpage error for the following URL:

Other symptoms

Non-proxied applications protected by mod_osso deployed on the same Oracle HTTP Server can be accessed without error.

The External Application can be accessed successfully using the link in the SSO Administer External Applications page. This page can be accessed via http(s)://SSOHOSTNAME.DOMAIN:PORT/pls/orasso after login as orcladmin user.

The HTTP Header trace for the failing request shows that mod_osso redirects back to a garbage URL e.g.



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