Partial VUsers getting disconnected and getting error as [10061] Connection refused

Hi Experts,

Kindly guide me with the following problem. I apologize is the same exists on the forum, I tried to explore but was unable to find the solution.

I have an application server (JBoss) which connects to a database (PostGres) and follows HTTP protocol.

I'm trying to test the performance by running concurrent users through LoadRunner.

For a load of say 300 users, around 190 gets through the run while for the balance an error is shown as "Failed to connect xxx.xxx.xxx.xxx:xxxx. [10061] Connection refused".

This count varies with each run. I've increased the Step-Download & Keep-Alive value also in Run-Time settings to offset any delay during the run. My entire environment is on LAN.

Kindly help..

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Sourabh