Knowledgebase: SmartCode VNC Manager
Network scan fails to find most of VNC/RDP servers
Posted by Yury Averkiev, Last modified by Yury Averkiev on 21 March 2008 01:05 PM

Microsoft have recently imposed limitations to the amount of half opened outbound connections a program can make in their latest service pack for Windows XP SP2. If you are interested in the details then look here: then scroll to the TCP/IP section and read the section titled "Limited number of simultaneous incomplete outbound TCP connection attempts". This affects VNC Manager as when it scans for computers it creates many simultaneous connections, which may or may not respond.

Please read the following post in our forum for information on how this problem can be fixed.