Solution H see above may address some non-Windows clients. If authentication is cross-domain, then you will need a forest trust only 8 trusts of all trusts with NETID are not forest trusts.
Kerberos authentication requires a valid SPN at each of the stops in the authentication chain the client, the member server and the DC. Kerberos authentication is time-sensitive, that is to say that all of the stops in the authentication chain need to be within 5 minutes of each other.
If a web browser is used, there is sometimes special configuration required to get Kerberos working with it. Workaround G is another example of this. See workaround A. Opera has never supported any NTLM protocol. IT Connect. Search IT Connect:. Known Problems ID. But since everyone was using a password which was generated with the old recommendations and the old protocol, the new password authentication mechanism had to be backward compatible to avoid business disruption.
Therefore a new mechanism was built: eight more bytes again seven bytes for the password, one parity byte were added to the password to enable passwords up to fourteen characters.
To maintain the usability of the old passwords, the new bytes were concatenated to the old half. It was considered that this hash will not be broken that easily. But that was not the truth…. This mechanism is still risky: if a password is shorter than fourteen characters, all unfilled bytes will be filled with NULLs.
So if a password is shorter than 8 characters, the second half the new half will remain empty and will be filled with those zero values. Both halves — again — will be hashed and concatenated. But since the second half only contains zeroes, a hash over those zeroes is created. So every time the second half is filled with zeroes, the same hash value will be used for the second part of the password. If the password is split in two halves an attacker could compare the second half with the default hash for a password containing only zeroes.
If it matches, the attacker can be sure that the password has less than eight characters. Breaking the hash of the first half is easy: the attacker only needs to brute-force the eight byte hash, which can be achieved in under 6 hours.
To understand why you should not use NTLMv1 anymore, you have to understand how this protocol works. It is the default authentication protocol of Windows NT 4. This leaves NTLMv1 at a high risk and therefore you should avoid using it. Many old devices in your environment could still use those old authentication protocols. There are multiple ways to make this configuration change.
You only need to pick one. An example website like that is sharepoint. To fix your browser configurations, find the browser s you use below. Internet Explorer and Chrome on Windows rely on the Intranet zone configuration to determine what type of authentication they use with a given website. IT Connect.
Search IT Connect:. Before we get started If you are running Windows, then this is the page for you. Click OK and confirm the setting change. You are done configuring Windows!
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