Is there a known issue with the leak of network buffers in Lansweeper? The Lansweeper server has the problem after about 14 days that no TCP connections, no matter which program, are possible. For example, putty say "Network Error: no buffer space available". After restarting the Lanserver service, connections are possible again. The version of Lansweeper is 126.96.36.199
Solution: netstat -qno is my friend. The process that eat the socked buffer is "swi_fc.exe" from the SOPHOS Endpoint Protection. The process try to connect a Proxy-Server which is not permitted on the firewall. So it's not a problem of Lansweeper
The standard range of 16.000 should be more than enough for Lansweeper operation, but that depends on your setup, of course... on my setup, with ~9000 machines and a single server, I have 180 connections open right now, not running any schedule scans...
If you want a GUI tool, you have TCPView, but that is getting a little old :