The best replacement for ntlm authentication is kerberos.


The best alternatives to ntlm authentication are rated as following:
★★★★★  kerberos
★★★  basic
★★  basic authentication

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Speaking about ntlm authentication, one probably shouldn't forget about httpclient.

Other search terms related to ntlm authentication and their ratings are:

★★★★★ httpclient
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ntlm authentication
kerberos
basic