Built-in Services
This shows hundreds of services because you are using “listAdapterServices”.
For connections you must use “pub.art.connection:listAdapterConnections” This will also provide the basic info for ALL connections (link), and not the properties that you need. However, there isn’t a supported service (i.e., in WmART or WmPublic) to fetch the connection properties, but there is an option in WmRoot which is not recommended.
Administrator API
You are better off using the Administrator API and your error message clearly indicates that it needs credentials; read this (link).
Are you invoking the API via browser?
Use a client like Postman or try developing an IS service, so you can pass the credentials easily and test.
KM
#webMethods#Integration-Server-and-ESB#JDBC-connections#webMethods-io-Integration#adapter#webMethods-cloud