Proxy Authentication

hi all,

i have the RCM3700 and my network requires a proxy authentication. do i have to send an authentication header to the proxy server? and if i have to, how is that possible? also, how can i define the proxy server address and the port in the RCM3700? i did some research and i found out that a protocol called NTLMSSP (NT Lan Manager Security Support Provider) is used to do the authentication. but i don’t know how to send a packet using this protocol to the server. i hope that anyone can help me with this problem. thanks in advance.