Should your SQL Server instance exclusively support Windows authentification then it is possible that you receive an error like this when starting JobScheduler:
This error occurs when the jTDS driver is used. To solve the problem please downlaod the driver with your current version http://sourceforge.net/projects/jtds/files/jtds. In the zip file there should be a file named ntlm.dll in the folder x86/SSO. Please copy this .dll file to the folder jre/bin of the JVM used by JobScheduler. Then restart JobScheduler to make changes effective.