Unable to retrieve backend SEARCH connection

That error message is pretty common with Directory Proxy Server. Here are the reasons why:

Upon reception of a request, DPS tries to route the request to the target data views, based on the request (base) dn. When this step fails (misconfiguration), a "No such Object" error is returned with additional text "The entry foo=bar is not handled by the server.
Then DPS selects the "best" directory server associated with the target data view according to the load-balancing algorithm. If no valid directory server is found, the error "Unable to retrieve backend SEARCH connection" is returned.

There are 4 possible causes:
- the data source pool associated with the target data view is empty (configuration problem)
- the data sources in that data source pool are disabled or have search-weight/bind-weight set to 0 so they are not considered valid servers to process search/bind operations (configuration problem)
- every data source (directory server) in that data source pool are down
- the max number of connection to every data source is reached.

If you get these errors after a brain new deployment with the OOTB dps configuration, #1 is probably the cause: DPS default config comes with a default data view able to handle every suffix/request. This data view is associated with a data souce pool that is empty by default. You have to create at least one data source object, add it to that data source pool then set load-balancing weights.

More info are available at   http://docs.sun.com/app/docs/doc/820-4809/fhktx?l=en&q=dsee&a=view

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About


I am Sylvain Duloutre, I work as a Software Architect in the Oracle Directory Integration Team, the customer-facing part of Directory Services & Identity Management Product Development, working on Technical Field Enablement.

The views expressed on this blog are my own and do not necessarily reflect the views of Oracle.

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