Do check out the link above, it seems valuable. I just wanted to point out that Authen::Ntlm (that LWP::Authen::Ntlm uses without actually depending on it, which would have been useful) takes some liberties with the NTLMv2 protocol. I'm not saying it doesn't work, but the client nonce is always null, the time is calculated wrong (needs bigint support to really count the tenths of a microsecond since 1601), and unicode conversion is done by inserting nulls every other ASCII char, so if your password uses actual Unicode characters, it won't work.