Hello,
I would guess that the problem is that you're connection to an ASE instance and not a SQL Anywhere instance. The driver for SQL Anywhere isn't able to connect to the ASE instance. I guess you should use the ASE driver to connect instead of the SQL Anywhere driver.
Is there a different option in Sybase Central for ASE (something like "connect to an ASE database")?
Please post the entire error message you get.
Kindest regards, Wilbert