This is from one of my friends / customers, James, who's a keen Notes/Citrix guru: -
"W3ContextNtlmMode=1" in NOTES.INI works a treat! With the Notes client now able to talk NTLM, we can now have the Notes application in question in-line rendering images from a remote Microsoft IIS server (which stores customer signatures captured on a pad)!
James also pointed out out that there's a useful IBM Technote that outlines some of the challenges with Notes and NTLM, including: -
<snip>
The main point is that Microsoft proxies that use NTLM (Windows domain authentication / Microsoft security's protocol) is not supported. The protocol is a proprietary protocol (much like NRPC) that Microsoft uses in its suite of products (IE, Outlook, Windows login).
</snip>
and: -
<snip>
The only workaround for this is to disable NTLM authentication.
</snip>