Thank you for clarifying. I see this logged message at the time when nobody able to connect to this host (night time for example). However this hosts exposed outside of my internal network by port forwarding on router/ Ports are not default RU ports) . Does this message mean somebody from internet scanning such ports? Can this log message be modified to provide more info (like source IP of call) ?
I confirm same problem immediately after upgrade from 6.10 to 7.0 Viewer at windows 7 64 bit, host at windows 10 64 bit . Host use CallBack. After host was rolled back to 6.10 (viewer still 7.0) problem disappear.
Viewer - 18.104.22.168 Host - 22.214.171.124 Host Computer connected to network via VPN Windows 10, Firewall off for any connection mode.
Windows RDP setting allow to connect, user name added to "allow" list.
Viewer able to connect to host using Internet-ID (all settings are defaults) Viewer have RDP connection settings - "ask for credential." When I try to connect it's return : "This computer can't connect to the remote computer. Try connecting again. If the problem continues, contact the owner of the remote computer or your network administrator."
It's Never ask user name or password
From the RU Host log file: RDP connection. Access denied. Because of the security settings.