OAM WebGate Returns ErrBadAuthnScheme Calling Logout Pages Protected by Anonymous Authentication Scheme (Doc ID 462120.1)

Last updated on MARCH 08, 2017

Applies to:

COREid Access - Version: 10.1.4 and later   [Release: 10g and later ]
Information in this document applies to any platform.
Checked for relevance on 12-Apr-2010

Symptoms

An anonymous authentication scheme has been configured in Oracle Access Manager to protect the application login and logout pages, with the aim of enabling DenyOnNotProtected for the site. All other pages are protected by authentication schemes of higher levels.

The application logout page references stylesheets and/or images.

Logout from the application generates the following error in the WebGate oblog.log:

The authentication scheme used for login is unknown to the WebGate plug-in. The scheme mask is 0


Sample trace WebGate oblog.log entries:

2007/09/21@10:03:57.514393 24335 16384 WEB ERROR 0x0000151F
/usr/abuild/Oblix/1014lwhf/palantir/commonlib/src/apache_req_info.cpp:108 "WebGate Error Report" Message^The authentication scheme used for login is unknown to the WebGate plug-in. The scheme mask is 0.  ReqReq^GET /css/default.css HTTP/1.1 ReqProto^HTTP/1.1 ReqHost^la.broom.emeaad ReqStatLine^ ReqStatus^200 ReqRawUri^/css/default.css ReqUri^/css/default.css ReqFilename^/css/default.css ReqPath^ ReqArgs^

2007/09/21@10:03:57.514502 24335 16384 AUTHENTICATION ERROR 0x0000150C
/usr/abuild/Oblix/1014lwhf/palantir/webgate2/src/authenticate.cpp:829 "The authentication scheme used for login is unknown to the WebGate plug-in" HTTPStatus^500



Enabling HTTP Header trace for logout shows that the first stylesheet requested after the logout page fails with ErrBadAuthnScheme

e.g.

GET https://oam.oracle.com/css/default.css

Response Headers:
   ......
   Location[/oberr.cgi?status%3D500%20errmsg%3DErrBadAuthnScheme%20p1%3D0]

GET https://oam.oracle.com/oberr.cgi?status%3D500%20errmsg%3DErrBadAuthnScheme%20p1%3D0

Cause

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