The local windows security policy changes are as follows:
Browse to Computer Configuration->Windows Settings->Security Settings->Local Policies->Security Options
Look for "Microsoft network client: Digitally sign communications (always)" and change it to Disabled
You may also need to do the same for "Microsoft network client: Digitally sign communications (if server agrees)". In theory this should be negotiated during the negotiate/challenge phase of NTLM but it may fail; NTLM doesn't explicitly demand any real negotiation.
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