The public URL of the computer logon agent is downloaded to the logon client automatically when the logon client connects to the logon agent. Typically, this happens when the user makes an on-site login. However, in some cases where users cannot make an on-site login at all, then the users have to manually enter the public URL of the logon agent in to their logon clients.
In the other case where you do not want to add an A record to your public DNS records, then your users will have to manually enter the public URL of the logon agent in to their logon clients.
In the User Console, click the "Agent" tab, then click the "Add Agent" button
In "Address" Enter the DNS name of the logon agent, e.g. dsmfa.la.deepnetid.com
Click SAVE
The logon client should be able to resolve the IP address of the newly added agent