A dedicated application pool must be created for the rs_server.dll and rs_client.dll web server extensions. All worker recycling options need to be turned off as the Relay Server utilizes long running worker processes.

To create the application pool

1. Start IIS Manager Console.

2. Right-click Application Pools and create a new application pool, for example RS_POOL.

3. Edit the properties for the application pool you created:

   1. Select the Recycling tab and turn off all the recycling options.

   2. Select the Performance tab and do the following:

      1. Turn off Shutdown Worker Processes After Being Idle.

      2. Set the number of worker processes to the total number of processing cores. You can further adjust this number depending on your usage and performance preferences. See the IIS performance notes about Web garden size for more information.