In this post, you’ll learn more about the Error WS_E_PROXY_REQUIRES_NTLM_AUTH – 0x803D001A that is returned when working with the COM-based APIs in Win32
Win32 COM Error
WS_E_PROXY_REQUIRES_NTLM_AUTH – 0x803D001A
Win32 COM Error Error Description
The HTTP proxy server requires HTTP authentication scheme ‘NTLM’.