Configuring JDBC Connector

Hi,

i have to use stored procedures from a SQL Server 2005. Therefore i tried to establish a JDBC-System under System Administration->System Configuration->System Landscape->New System (from template)->JDBC System.

I entered the same correct values that worked for the BI JDBC System. The Connection Test always throws the following error:

Linked2 Exception: com.sapportals.connector.connection.ConnectionFailedException: Connection Failed: Could not establish connectionLinked Exception: com.sapportals.connector.connection.ConnectionFailedException: Connection Failed: Could not establish connection

Thanks for any help!