Access To Application Protected With OAM 10g Hangs / Fails When Server Where One Of Primary Access Servers Is Running Goes Down (Doc ID 1476129.1)

Last updated on MARCH 08, 2017

Applies to:

COREid Access - Version 10.1.4.3.0 and later
Information in this document applies to any platform.

Symptoms

There is a Production application configured with Oracle Access Manager 10.1.4.3 with High Availability (HA). There are two Access Servers running on two different machines e.g. AccSrv01 and AccSrv02.

On the application tier webserver, WebGate 10.1.4.3 is installed and configured with the two Access Servers as Primary servers. There are no Secondary servers configured.

When the AccSrv01 machine goes down abruptly, without gracefully stopping the processes, the OAM-protected application is still accessible.

However when the AccSrv02 machine goes down abruptly, access to the OAM-protected application is no longer possible, it seems to hang. The browser just stays loading with white page displayed, and no response is received from the application webserver where the WebGate is installed, although all processes are still running there. The webserver access log does not show any sign of the application page request being received.

This is not a load-balancer routing issue because the problem reproduces with direct access to the application webserver port bypassing the load-balancer.

This hanging browser/white page problem when accessing the application continues until the AccSrv02 server can be pinged again. NOTE: even though the Access Server is not yet restarted on AccSrv02, as long as the machine itself can be pinged, the problem no longer occurs. Then the application requests are served successfully once more by the application webserver and WebGate successfully communicates with the active Access Server on AccSrv01.

If the Access Server and other running Oracle processes are stopped gracefully on AccSrv02 before the machine is rebooted then the problem does not reproduce. The problem only occurs when the machine is brought down for reboot abruptly or the server crashes or network routing to that server suddenly fails.


Cause

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