1. Please first make sure the manager site on A is running and can be visited from http://A/printusage
2. If you have manually configured the manager site running on a different port, say http://A:800/printusage, you should use the full URL in the Master Server, that is http://A:800/printusage
3. If you have specified another name of printusage virtual directory, say http://A/print, you should use the full URL in the Master Server, that is http://A/print
4. Please make sure you are using MS SQL Server or MySQL as database on A. MS Access is not supported in this distributed environment.