I too am having issues with the same release of Solus3 and am trying to upgrade to the new new Summer release, we are having issues with 'The remote machine cannot be contacted' and 'Access denied to the remote machine' The firewalls are all off and WMI is enabled on the PC's, they are new builds in our new domain.
We cannot even install the agent manually with our domain admins accounts, the service refuses to start. I have a call with Capita