KB14985: How does the connection pooling work in MicroStrategy Web?

A connection pool is a collection of TCP connections maintained in the Web server's memory. There are two types of TCP connections: busy and idle.
Below is a diagram of the flow of information:
 

 
The Web server will create a new TCP connection if it determines that only two connections are idle. For example, if Initial Pool Size is two, when the first user logs in to Strategy Web, a new TCP connection is created. TCP connections will stay open (in an established state) until only one of the following two events occurs:

1. Strategy Intelligence Server is manually disconnected from the Web server.
2. The Web server determines that Strategy Intelligence Server is down.

If no connection is available within the timeout setting, the user receives a 'server busy' error message, as shown below:

 
By default, the setting 'Server busy timeout' is set to 10 seconds, as shown below: