def db = [url: "jdbc:sqlserver://xxx.xx.xx.xx:1433",user: 'abc', password: 'pwd', driver:'com.microsoft.sqlserver.jdbc.SQLServerDriver']
def sql1 = Sql.newInstance(db.url, db.user, db.password, db.driver)

def db = [url: "jdbc:sqlserver://172.16.16.18:1433:master",user: 'maxidreader', password: 'Re@de$R', driver:'com.microsoft.sqlserver.jdbc.SQLServerDriver']
def sql1 = Sql.newInstance(db.url, db.user, db.password, db.driver)

Error
org.codehaus.groovy.runtime.InvokerInvocationException: com.microsoft.sqlserver.jdbc.SQLServerException: The port number 1433:master is not valid.