This procedure is unsupported.
Articles in the "Unsupported Community Documents" space are not supported by ITRS support.
How can I perform https checks against websites using NTLM-authentication?
NTLM authentication is not supported by default in the plugin check_http or in Webinject. There is, however, a plugin available at Nagios Exchange which can handle NTLM-auth. It's a shell script acting as a wrapper for curl which supports NTLM-auth.
Please note Nagios_Exchange plugins are not directly supported by ITRS and we can't guarantee compatibility with all the versions of OP5 Monitor product.