its the gproxyi dont know why , i had that problem too ( to fix it i had to reinstall system ) or you could try to reinstall framework + visual runtime package 2010 , fix regs , clean pc , open ports , allow at firewall gproxy or try to change the gproxy port (open the cfg)
Than you had a connection error bcs of most cases its bcs of gproxy (if it happens more times )