Let us first look at the requisites for both the modes: The agent mode requires the agent to be installed as a service and run with administrative privileges to perform password changes. The communication between the PMP server and agent takes place through TCP for normal information and HTTPS for password transfer and hence communication paths must exist (ports to be kept open) between the server and agent. For the agentless mode, you must supply administrative credentials to perform the password changes. For Linux you must specify two accounts, one with root privileges and one with normal user privileges that can be used to login from remote. Telnet or SSH service must be running on the resources. For Windows domain, you must supply the domain administrator credentials. For Windows and Windows domain, PMP uses remote calls and relevant ports must be open on the resource. Based on this you can choose which mode you want for your environment, indicated by the following tips: Choose age