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Accessing a mod_osso Protected URL Results in "Cannot Find Server or DNS Error" (Doc ID 294761.1)

Last updated on MARCH 21, 2019

Applies to:

Oracle HTTP Server - Version 9.0.2 to 10.1.4 [Release 9iAS to AS10gR2]
Oracle Application Server Single Sign-On - Version 9.0.4 to 10.1.4 [Release 10gR1 to 10gR3]
Email Server - Version 9.0.4.2 to 9.0.4.2 [Release 9.0.4]
Information in this document applies to any platform.
***Checked for relevance on 13-MAR-2019***
Oracle9iAS Single Sign-On - Version: 9.0.2 to 9.0.2.3
Email Server - Version: 9.0.4.2 to 9.0.4.2
Oracle HTTP Server - Version: 9.0.2 to 9.0.2.3
This can occur on any platform.

Symptoms

 Clicking link to a mod_osso protected URL results in:
Cannot find server or DNS Error
Clicking back button or entering URL again and the URL is displayed correctly. This is because the OHS cookie is set (258200.1).

HTTPS (SSL) is configured between the browser and a reverse proxy, e.g. Webcache.
HTTP is configured between the reverse proxy and the midtier OHS where the protected URL is served.
So the configuration is like this:

browser -- HTTPS --> Webcache -- HTTP --> OHS

The failing URL is shown as the originally requested URL except that the "https:..." is replaced with "http:..."
This can be confirmed using http header trace (see 248870.1 step 7)

Cause

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