I was using mono 2.6.7. Upgrading to 2.10.8 solves the problem. -- View this message in context: http://mono.1490590.n4.nabble.com/Clients-can-make-maximum-15-connections-to-linux-custom-server-in-mono-tp4523150p4538563.html Sent from the Mono - General mailing list archive at Nabble.com.