BAM data cache web service - single thread?

Hi all,
I have 2 load-balanced BPEL servers trying to push data to the same BAM server via the BPEL-to-BAM web service interface. In the logs, on one of the BPEL servers, I get this following error quite frequently:
<WARN> <default.collaxa.cube.sensor> BAM exception: java.io.IOException message: Authentication Failed for Basic realm="diaaihbamtst01.dia.dnvr" BAM domain: DIAAIHBAMTST01 BAM user: BAM BAM basic auth: DIAAIHBAMTST01/BAM BAM URL: http://DIAAIHBAMTST01.dia.dnvr:80/OracleBAM/Services/DataObject/DataObjectOperations.asmx
I suspect that the BAM web service is busy dealing with data from the other server - which results in it throwing this error/warning. If I stop the other server, I see this message in the log for the machine that was getting the above messages:
BAM endpoint http://DIAAIHBAMTST01.dia.dnvr:80/OracleBAM is back online
- and then I don't get any more errors.
Does anyone know if there's a setting that would allow 2 incoming web service ADC calls to occur simultaneously from 2 separate BPEL servers?
Thanks,
Lon

We are using 10.1.3.3 and we did update patch MLR-15 for some other cause with 11i. We are experiencing same issue in our production. Please let us know, if you have any good input. I really appreciate your help.
Rama K

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