https://userapps.support.sap.com/sap/support/knowledge/en/3070148
3070148 - Diagnostics agent can not be trusted as the secstore.properties file is corrupted | SAP...
https://userapps.support.sap.com/sap/support/knowledge/en/3275109
3275109 - Transport issues if SecStore is used for catalog passwords | SAP Knowledge Base Article
After upgrade or after implementing the notes SAP Note 3125579 - Enhanced Security for catalog credentials - feature implementation SAP Note 3133044 - Security...