Remote Desktop event ID 20499. No noticeable issues

Using Group Policies (best practice) Open Group Policy.

In Computer Configuration, Administrative Templates, Windows Components, Terminal Services, Sessions, enable the settings you want to configure. See the policy explain text for more information.

Or

Using Terminal Services Configuration Open Terminal Services Configuration.

In the console tree, click Connections.

In the details pane, right-click the connection for which you want to modify time-out settings, and then click Properties.

On the Sessions tab, above End a disconnected session, select the Override user settings check box. This allows you to configure time-out settings for the connection.

Configure the following time-out settings as appropriate:

In End a disconnected session, select the maximum amount of time that a disconnected session remains on the server. When the time limit is reached, the disconnected session ends. When a session ends, it is permanently deleted from the server. Select Never to allow disconnected sessions to remain on the server indefinitely.

In Active session limit, select the maximum amount of time that a user's session can remain active on the server. When the time limit is reached, either the user is disconnected from the session or the session ends. When a session ends, it is permanently deleted from the server. Select Never to allow the session to continue indefinitely.

In Idle session limit, select the maximum amount of time that an idle session (a session without client activity) remains on the server. When the time limit is reached, either the user is disconnected from the session or the session ends. When a session ends, it is permanently deleted from the server. Select Never to allow idle sessions to remain on the server indefinitely.

Source

Create a group policy that uses the restricted groups feature to place "Domain Users" in the "Remote Desktop Users" group. Apply that policy to your server, overriding the local policy. Log in as domain admin and make sure the policy refreshes. When you examine the remote desktop users group, verify that "domain users" has been placed in this group. Now, log off and test as one of your domain users.