I successfully added some devices to my prime infrastructure 3.9 using SNMP and SSH credentials. Now the devices are all in state "managed". But I am unable to change the device configuration or at least parts of it. I can change des Interfaces, VLANs and ACLs but some other features are not showed in configuration tab. For example I want to turn on the scp server. I dont see any error messages. What am I doing wrong?