Hi,
- Please try to log on directly (console mode login, not RDP connection) to the Dell computer when the problem occurs. Then open the task manager, click users and expand the user information to view the session resource usage of the RDP session / user initiated by HP at this time. Note that when "please wait" is displayed on the Mac, whether the session / user initiated by the MAC is displayed in the users expanded information list of the task manager of the remote computer (indeed Dell). If it is displayed, it is recommended that you manually disconnect HP's session / user, and then check whether MAC RDP has successfully established the connection.
- It is recommended that you first use the same user credentials to publish RDP connection from HP and MAC. After completing the above operation, publish RDP connection with different users credentials from HP and MAC to see if there are similar problems.
- Additionally you could also view the event log on the remote computer, if it gets a corresponding error logs on the basis of problem occurred time. An useful event log will also be helpful to troubleshooting.
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Best Regards