The S99SybaseIQAgent15 script should be owned by the same UID that is used to run all the servers. Do not use the root user account.
On Windows, you must change the owner of the Sybase IQ Agent. The user who starts the agent will be the creator and owner of multiplex databases and server directories, and must have write privileges on all of the servers in the multiplex. By default, the System account starts the agent.
Choose Administrative Tools > Services.
Right-click “Sybase IQ Agent” and choose Start.
On the General tab, choose Automatic for Startup Type.
On the Log On tab, change the Log on as: option from the System Account to This Account.
Type domain\username for an account with the appropriate privileges in the account text box.
or
Browse to select an account, then click OK.
Type and reconfirm that account’s password, then click OK.
Changing the user