Forum Discussion
2026-04 Update Breaks Domain Logins
You will not have a change to access the domain controller, because there are no local users available.
The only possible solution I have found is:
- Restore domain controller from backup before install the update.
- Then reset the password of the administrator. This will force to generate an AES key.
- Install the update again.
Please have also a look on:
https://learn.microsoft.com/en-us/windows-server/security/kerberos/detect-remediate-rc4-kerberos
https://support.microsoft.com/en-us/topic/how-to-manage-kerberos-kdc-usage-of-rc4-for-service-account-ticket-issuance-changes-related-to-cve-2026-20833-1ebcda33-720a-4da8-93c1-b0496e1910dc
In my environment it has worked. Hope it works for you.
Good luck
You will not have a change to access the domain controller, because there are no local users available.
The only possible solution I have found is:
- Restore domain controller from backup before install the update.
- Then reset the password of the administrator. This will force to generate an AES key.
- Install the update again.
Please have also a look on:
https://learn.microsoft.com/en-us/windows-server/security/kerberos/detect-remediate-rc4-kerberos
https://support.microsoft.com/en-us/topic/how-to-manage-kerberos-kdc-usage-of-rc4-for-service-account-ticket-issuance-changes-related-to-cve-2026-20833-1ebcda33-720a-4da8-93c1-b0496e1910dc
In my environment it has worked. Hope it works for you.
Good luck