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windows/security/threat-protection/security-policy-settings/domain-member-disable-machine-account-password-changes.md
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@ -14,7 +14,7 @@ manager: dansimp
audience: ITPro
ms.collection: M365-security-compliance
ms.topic: conceptual
ms.date: 04/19/2017
ms.date: 06/27/2019
---
# Domain member: Disable machine account password changes

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windows/security/threat-protection/security-policy-settings/domain-member-maximum-machine-account-password-age.md
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@ -14,7 +14,7 @@ manager: dansimp
audience: ITPro
ms.collection: M365-security-compliance
ms.topic: conceptual
ms.date: 05/31/2018
ms.date: 06/27/2019
---
# Domain member: Maximum machine account password age
@ -28,22 +28,22 @@ Describes the best practices, location, values, and security considerations for
The **Domain member: Maximum machine account password age** policy setting determines when a domain member submits a password change.
In Active Directory–based domains, each device has an account and password. By default, the domain members submit a password change every 30 days. You can extend or reduce this interval. Additionally, you can use the policy **Domain member: Disable machine account password changes** to disable the password change requirement altogether. However, before you consider this option, review the implications as described in [Domain member: Disable machine account password changes](domain-member-disable-machine-account-password-changes.md).
In Active Directory–based domains, each device has an account and password. By default, the domain members submit a password change every 30 days. You can extend or reduce this interval. Additionally, you can use the **Domain member: Disable machine account password changes** policy to disable the password change requirement completely. However, before you consider this option, review the implications as described in [Domain member: Disable machine account password changes](domain-member-disable-machine-account-password-changes.md).
> [!IMPORTANT]
> Significantly increasing the password change interval (or disabling password changes) gives a malicious user more time to undertake a brute-force password-guessing attack against one of the machine accounts.
> Significantly increasing the password change interval (or disabling password changes) gives an attacker more time to undertake a brute-force password-guessing attack against one of the machine accounts.
For more information, see [Machine Account Password Process](https://blogs.technet.microsoft.com/askds/2009/02/15/machine-account-password-process-2/).
### Possible values
- User-defined number of days between 1 and 999
- Not defined.
- User-defined number of days between 1 and 999, inclusive
- Not defined
### Best practices
1. It is often advisable to set **Domain member: Maximum machine account password age** to about 30 days. Setting the value to fewer days can increase replication and impact domain controllers. For example, in Windows NT domains, machine passwords were changed every 7 days. The additional replication churn would impact domain controllers in large organizations with many computers or slow links between sites.
2. Some organizations pre-build computers and then store them for later use or ship them to remote locations. When a computer starts after being offline more than 30 days, the Netlogon service will notice the password age and initiate a secure channel to a domain controller to change it. If the secure channel cannot be established, the computer will not authenticate with the domain. For this reason, some organizations might want to create a special organizational unit (OU) for computers that are prebuilt, and configure the value for this policy setting to a larger number of days.
1. We recommend that you set **Domain member: Maximum machine account password age** to about 30 days. Setting the value to fewer days can increase replication and affect domain controllers. For example, in Windows NT domains, machine passwords were changed every 7 days. The additional replication churn would affect domain controllers in large organizations that have many computers or slow links between sites.
2. Some organizations pre-build computers and then store them for later use or ship them to remote locations. When a computer is turned on after being offline more than 30 days, the Netlogon service notices the password age and initiates a secure channel to a domain controller to change it. If the secure channel cannot be established, the computer does not authenticate with the domain. For this reason, some organizations might want to create a special organizational unit (OU) for computers that are prebuilt, and then configure the value for this policy setting to a greater number of days.
### Location