PPTP

PPTP:
  Firmware: 1
  Hostname: 0655_XBJjoEOh
  Vendor: MikroTik

HTTP/1.1 407 Proxy Authentication Required
Proxy-Authenticate: Digest realm="proxy", nonce="662a6933", qop="auth"
Content-Type: text/html
Cache-Control: no-cache
Content-Length: 166