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No Machine in the DBA/{function=null} Cluster is Responding to DBA.ADMIN in OAS Scalability (Doc ID 742620.1)

Last updated on MAY 06, 2022

Applies to:

Oracle Transportation Management - Version 5.5.04 to 5.5.05 [Release 5.5]
Information in this document applies to any platform.
This problem can occur on any platform.


-- Problem Statement:
OTM Setup with Scalability on Oracle Application Server ( OAS) with the following Server Set up:
2 Application Servers
2 Web Servers
2 Physical Servers, each with a Web and Application server configured.
The two application servers are set in Active-Active Mode with no specific Application function assigned to any server

The Scalability Overview screens (Clusters, App-Tier Machines, Web-Tier Machines, Verification) are all indicating that both machines (2 of 2) in the Default Cluster are responding, and there are no signs of any problems.

When attempting to shut down one of the App Servers, the Scalability Overview screens indicates, as expected, that the machine is not responding.

When you restart the App Server, the same screens now show as expected; that both are again responding. But, when you shut down the other (second) App Server and attempt to access OTM from the browser, the following error occurs stating that no machine in the cluster is available.

No machine in the DBA/{function=null} cluster is responding to DBA.ADMIN"

-- Steps To Reproduce:
1- Shut down the first Application server.
2- The Scalability Overview screens all indicate, as expected, that the machine is not responding.
3- Re-start the first App. server.
4- The Scalability Overview screens all indicate, as expected, that that both servers are again responding.
5- Shut down the second Application server.
6- Attempt to access OTM from the browser.
7- See the error.


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