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Lotus Notes Prompts for Authentication When Displaying HTML E-mails

Document ID: 117942

Updated: Jul 15, 2014

Contributed by Denis Jacobi and Siddharth Rajpathak, Cisco TAC Engineers.

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Question

Why does Lotus Notes prompt for authentication when displaying HTML e-mails?

Note: This Knowledge Base article references software which is not maintained or supported by Cisco. The information is provided as a courtesy for your convenience. For further assistance, please contact the software vendor.

Lotus Notes does NOT support NTLM authentication, it only supports Basic authentication.

If you configured your Identities to only use NTLMSSP, then authentication with Lotus Notes will not work. The user gets continuously prompted for authentication, even after entering the correct credentials.

In order to address this problem, you can configure the Identities to use "NTLMSSP or Basic" authentication scheme instead of NTLMSSP only.

For more information please see the section "CASES WITH AUTHENTICATED PROXIES" of IBM's knowledge base article "Troubleshooting Internet HTML e-mails with images appearing as red Xs".

Updated: Jul 15, 2014
Document ID: 117942