When you design a mapping, the Secure Agent accesses sources and targets so that you can read and write data.
For example, when you add a Source transformation to a mapping, the Secure Agent accesses the source to display the fields that you can use in the rest of the mapping. The Secure Agent also accesses the source when you preview data.
To access a source or target, the Secure Agent uses the connection properties. For example, the Secure Agent might use the user name and password that you provide in the connection properties to access a database.