I have a 5 machine peer to peer network all using Win 7. A few months ago I started getting error 519 "can't connect to client" errors on all the client machines. Tech support had me set up telnet and the host machine could get to all the clients so outgoing works. Then they had me try and connect from the client machines and all the client machines couldn't connect to the host, so the host machine is somehow blocking inbound data. I have disabled virus protection and turned off the firewall but it still cannot connect. the network is fine for normal use. Help -- anybody have any ideas about what it can be?