Example URL, Networking must be enabled in Mahara Settings if you want portfolio services and users to roam from Moodle to Mahara
Site administration > Plugins > Manage portfolios
Block Network servers
You may use the role Authenticated user - All logged in users. Site administration > Users > Permissions > Define roles > Manage roles: Roam to a remote application via MNet - moodle/site:mnetlogintoremote = Allow
Site administration > Plugins > Blocks > Manage blocks > Network servers = Show