enum EXFFirewallType
{ 
  fftNoFirewall = 0, 
  fftSocks4 = 4, 
  fftSocks5 = 5 
  fftUserNoLogon = 6,
  fftUserAfterLogon = 7,  
  fftSite   = 8, 
  fftOpen = 9, 
  fftTransparent = 10, 
  fftPipe   = 11,  
}

The meaning of each value is detailed in the FirewallType property topic's description of its possible values.