05.05
There is a default limit for simultaneous TCP connections to one workstation under windows XP. The reason is decreasing of spreading worm viruses while infecting.
When we need to change this value, there is the possibility with using patch or manual editing of tcpip.sys This situation may occur when we’d like use the workstation as a node for working proxy or similar. Windows HOME edition allows max 5 connection, Windows Prfessional allows the connection of 10.
This restriction may disable sharing in network, when connection aren’t closed properly.
full article: http://www.speedguide.net/read_articles.php?id=1497