sockets - Haunted by KillerService.exe while attempting to get C# server & client programs to communicate (from same machine) -

i made client & server programs in c# based on this example code.

server program:

tcplistener tcplistener = new tcplistener(8080); tcplistener.start(); 

first time ran this, windows firewall popped , asked me if should allowed network access.

client program:

iphostentry ip = dns.gethostentry(tbserver.text);//"mycomputer-msi" string addr = ip.addresslist[0].tostring(); tcpclient clientsocket = new tcpclient(addr, 8080); 

at last line above, got message:

an unhandled exception of type 'system.net.sockets.socketexception' occurred in system.dll
additional information: no connection made because target machine actively refused it

i made sure both programs (client.exe , server.exe) allowed windows firewall. no other antivirus enabled (as far know).

checked conflicts command netstat -a -b:

 [killerservice.exe]    tcp      127.0.0.1:8080           mycomputer-msi:0            listening 

the strange thing killerservice.exe (which can't find in of tabs when ctrl-alt-del) changes address match whichever port use server program.