rsdb/ssfs_connect is a SAP Parameter attribute which is used to control Default DB Connect via secure store information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter determines if the secure store in the file system
should be retrieved to get the connect information for the
connection to the default database of the system and for the service
connections (starting with prefix "R/3*").
The value "0" determines that the secure store in the file system
will not be retrieved. The connect information will be get by the
DBSL implementation.
The value "1" determines that the usage of the secure store in the
file system is enabled. Whether or not the connection information
will be retrieved from this secure store is finally up to the DBSL
implementation and thus Database dependent.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.