Error al agregar Windows Server 2025 a dominio existente, nivel funcional 2016
Buenas a todos, Me dirijo a esta comunidad en busca de orientación para resolver un problema que se me está presentando al intentar integrar un nuevo servidor con Windows Server 2025 Standard a mi infraestructura de Active Directory existente. Descripción del entorno: Dominio de Active Directory activo con Windows Server 2019 Standard. Nivel funcional de dominio y bosque configurado en Windows Server 2016. Controladores de dominio actuales: server-dc01.impresoratec y server-ad2019.impresoratec. El nombre de dominio interno utilizado es impresoratec (nombre NetBIOS/dominio de etiqueta única, sin sufijo DNS completo tipo .local o .com). Problema: Al intentar agregar el nuevo servidor con Windows Server 2025 al dominio, el proceso falla y se presenta el siguiente mensaje de error: "Es posible que el nombre de dominio "impresoratec" sea un nombre de dominio NetBIOS. Si este es el caso, compruebe que el nombre de dominio está registrado correctamente con WINS. [...] La consulta se refería al registro SRV para _ldap._tcp.dc._msdcs.impresoratec. La consulta identificó los siguientes controladores de dominio: server-dc01.impresoratec y server-ad2019.impresoratec. Sin embargo, no se pudo contactar con ningún controlador de dominio." El mensaje sugiere que los registros de host (A) o (AAAA) pueden contener direcciones IP incorrectas o que los controladores de dominio no son accesibles desde el nuevo servidor. Lo que he verificado hasta ahora: Los controladores de dominio existentes están en línea y operativos. La replicación entre los DCs actuales funciona con normalidad. El nuevo servidor con 2025 tiene conectividad de red general, pero no logra localizar los DCs al momento de unirse al dominio. Mi consulta: ¿Alguien ha experimentado este comportamiento al incorporar un servidor con Windows Server 2025 a un dominio con nivel funcional 2016 y un nombre de dominio de etiqueta única (single-label domain)? ¿Existe algún requisito previo adicional —como la actualización del esquema de AD, ajustes en DNS o en WINS— que deba cumplirse antes de agregar el nuevo DC? Agradezco de antemano cualquier orientación o experiencia que puedan compartir.
Beyond RC4 for Windows authentication - Question regarding KB5073381
In KB5021131 MS recommends setting the value for DefaultDomainSupportedEncTypes to 0x38, in the new KB 5073381 it's 0x18. This removes the setting that forces "AES Session Keys" which should be fine if Kerberos Tickets can only use AES Encryption. But what about accounts that have RC4 enabled in their msds-supportedEncryptionTypes attribute? They could still use RC4 for Kerberos ticket encryption and would then also fallback to RC4 session ticket encryption. As far as I believe the DefaultDomainSupportedEncTypes was explicitly introduced to avoid this scenario. Or is there now some hard-coded mechanism that always ensures that Session Keys are AES encrypted?
Lots of DNS Server events 5504 on AD DNS server from Cloudflare etc
Hi! I'm getting about 18 events with id 5504 while trying to resolve some DNS names, like fullfiles.xyz. The DNS server is configured to use provider DNS and root hints. I can suppress these messages by disabling root hints or by disabling EDNS0 with dnscmd /config /enablednsprobes 0. I tried to use packet capture on the DC and on the router, and analyzed the results with AI, which answered: "You receive malformed patterns on the WAN interface." Can anybody explain the cause of this problem? Any ideas to fix it? Thanks!
Issues with Group Policy Update (gpupdate)
I am getting an error when I attempt to perform a gpupdate /force on workstations. I have checked the health of the DC's and find no issues. I am going to include a screenshot of the error - hoping someone can guide me as on how to resolve. The system will say to reboot but the policy never seems to run just keeps prompting for reboot.
Add support for sha-2 and sha3 in Supported Kerberos Encryption Types
https://techcommunity.microsoft.com/t5/core-infrastructure-and-security/decrypting-the-selection-of-supported-kerberos-encryption-types/ba-p/1628797 https://web.mit.edu/kerberos/krb5-devel/doc/admin/enctypes.html#enctype-compatibility It seems like `aes128-cts-hmac-sha256-128` and `aes256-cts-hmac-sha384-192` are supported by other Kerberos implimentations, but not yet supported by Windows Server. Can those be added to Windows Server? Also can you please think about adding sha-3 based ones too?
Securing ldap in WIndows AD
Hello everyone. I would like to secure the use of LDAP within an Active Directory domain. My domain has three Windows 2022 DCs. Searching online, I found these suggestions: Enforce LDAPS (LDAP over SSL/TLS) Disable Plain-text LDAP Bindings Block or Restrict Port 389 (Optional but Recommended) Enable Channel Binding Tokens (CBT) Does it make sense to only allow certain users to browse LDAP? Could limiting LDAP browsing to certain users cause problems? ThanksWindows 11 automatically restarting after install security Update — With GPO and WSUS.
Hi everyone, I’m facing a strange behavior with Windows 11 devices that receive updates through WSUS and are fully managed via Group Policy. Here’s the scenario: We have a GPO configured as follows: -Configure Automatic Updates → 4 (Auto download and schedule the install) -Scheduled installation every day at 10:00 -Install during automatic maintenance → disabled -Active Hours configured -Turn off auto-restart for updates during active hours → Enabled -Update deadlines set to 0 (to avoid any forced restart) -No other restart-related policies set in the domain Even with this configuration, after updates are installed, Windows 11 shows the following message: “Your organization manages update settings. We will restart and install this update at X minutes.” And then the device automatically restarts, even when: -a user is logged in -it is outside Active Hours -deadlines are disabled -no-auto-restart is enabled This behavior does not happen on Windows 10 — only on Windows 11.
