2.2.1.3 NNTP_AUTH_NTLM_Blob_Response Message

NNTP_AUTH_NTLM_Blob_Response is defined as follows. This message is partially defined in [RFC2980]. The status code 381 indicates ongoing authentication and indicates that the <base64-encoded-NTLM-message> is to be processed by the authentication software. In this case, the client MUST de-encapsulate the data and pass it to the NTLM software.

 381 <base64-encoded-NTLM-message><CR><LF>