PrintJobLimit Key missing in registry

Hi Guys,

 I have web application(.NET 2.0 VS2005), which uses CR 10.2

 Like many others, we are intermittently getting "The maximum report processing jobs limit configured by your system administrator has been reached" exceptions while generating Crystal Reports in PDF Format from our Asp.Net code.

 Many experts suggested that, the print job limit is controlled by the registry key called “PrintJobLimit”. We checked the registry of our production Windows 2003 server but didn’t find this entry.

Now my questions are,

1. If the key is not present then how does Crystal Report Engine decide the max limit?
2. Is the key not mandatory and can be added if we want to supersede the default setting?

 Thanks in advance.

Regard

Johnson.