Network Security: LAN manager authentication level

In windows server 2008, if we go to Network Security: LAN manager authentication level(gpedit.msc -> Computer Configuration -> WindowsSettings -> SecuritySettings LocalPolicies -> securityoptions ) and right click on it, we cannot change the value of the authentication level. It is greyed out.

To change this we need to go to following registry entry..

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\LmCompatibilityLevel and set the value.

LmCompatibilityLevel should be

0 for Send LM & NTLM responses
1 for Send LM & NLTM - use NTLMv2 session security if negotiated
2 for Send NTLM response only
3 for Send NTLMv2 response only
4 for Send NTLMv2 response only\refuse LM
5 for Send NTLMv2 response only\refuse LM & NTLM

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  3. Kevin SaptelMay 2, 2020 at 3:51 AM

    LAN means "Neighborhood", budget web UAE which implies your PC is associated with different PCs in a similar region, normally on the equivalent subnet or virtual LAN. To put it plainly, any PC with an Ethernet port is a LAN-proficient PC....and that is successfully every PC made over the most recent 10 years (obviously some will beat others, yet that is the situation with ALL innovation, not simply gaming machines.

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