HOUSTON, TX--(Marketwire - August 12, 2010) - Network Box USA (www.networkboxusa.com), the American arm of worldwide managed security service provider Network Box Corp., has signed CoNetrix as a channel partner to sell its managed service, which includes the award-winning Network Box unified threat management (UTM) appliance. CoNetrix is a Lubbock, Texas-based computer networking, security and compliance firm that primarily serves financial institutions.