No SET-Switch Team possible on Intel X710 NICs?
Hello, we have lot of servers from different vendors using Intel X710 DA2 network cards. They work fine in standalone and they work fine if we create switch independet teams using Server Manager, Regardless of Dynmic or Hyper-V Port. But sadly we can't use these teams in Server 2025 because have to create SET-Switch Teams instead. But as soon as we create an Hyper-V SET-Switch Team with X710 cards, they have limited to no network communication. They still can communicate with some servers, are slow with some ohters, and can't communicate with some at all. Especially communication to other servers, which also use X710 cards with SET-Switches, is zero. SET-Teams with other cards like E810 work just fine. I've read several times that the X710 cards just wont work with SET, even since Server 2016. But I can't really give up on this, since we would have to replace a lot of them. We have tried to disable a lot of features like VMQ, RSS, RCS... but couln't make it work. Firmware and Drivers are the most recent, but it happens with older versions too. Does anyone have a solution? Thank you!
RDP connection not possible and RDS-Virtualization role comes back after restart
Hello everyone, I have here an Windows Server 2022 Standard 21H2 (Build 20348.4052) (essentials) with the newest updates. This is the Domain Controller. Hyper-V is installed with one VM. The VM is a terminal server. In the past I have tried to install the terminal server on the Hyper-V Server. To do so I have installed all kind of remotdesktop roles. This was stupid of me. Especially it does not work on a DC. I want to connect as administrator by RDP (mstsc) to the server but it does not work anymore since I have installed all these roles and features. No other users are connected. I can still connect to the VM. In one situation I was able to connect to the server but after entering the password I have received the error 0x808 (0x101) that there is no licence server for remote desktop available. I have now removed all roles related to the terminal server and the rdp which I have installed. But I can not uninstall RDS-Virtualization. After uninstalling it comes back when I perform a restart. I have already tried Uninstall-WindowsFeature -Name RDS-Virtualization -Remove In the server manager appears a menu item about remote desktop services. But there is written that no connection broker server is in the pool. The submenu server lists my DC. I have found in the eventmanager a error related to the uninstalling process 0x80070057 wrong parameter But I do not have more information. DISM /RestoreHealth and sfc /scannow did not find any problems. I am not using VDI but is maybe the Hyper-V reinstalling the role after the restart? Do I need to uninstall the role to make RDP working again or could be there other reasons? Do you know where I find a detailed log about the problems about uninstalling the role and maybe the installing? Do you have any idea how I can find out more about the problem? Thank you!
Active Directory documentation and best practices
Dear all, please, I have to fix a critical situation. I have recovered a DC VM on an old Hyper-V host. This DC is corrupted and seems that it is not working as well. I installed 2 new phisical host (cluster) with Windows Server Datacenter 2025, configured Hyper-V role, networks etc.. Also prepared (out of cluster) 2 new VM Win 2025 and I would like to prepare as new DC01 + DC02. I guess is better to configure the DC on the hosts to grant that the DC role is always available also if the cluster is not running (feel free to correct if I'm wrong, I will appreciate). I need link to video or documents to correctly perform the configuration of the new DC. The old DC are running a Windows Server 2012 R2 standard version. Is it possible to migrate to Windows 2025 datacenter ? Take note that at the end I have to assign to the new DC, the same IP address. thank you very much for your support. BR Alex.
Hyper‑V SET Loop Risk, Asymmetric Paths & Active‑Standby (ALE OXE VM Offline)
Hi everyone, Environment - Windows Server 2025 Hyper‑V - One external virtual switch - Physical NICs combined with Switch Embedded Teaming (SET) - One VM: Alcatel‑Lucent Enterprise OmniPCX Enterprise (OXE) Questions → 1) Loop prevention → 2) Asymmetric traffic → 3) Active‑Standby Problem The OXE VM intermittently becomes unreachable (no ICMP, no SIP). Hyper‑V shows it as “Running,” CPU is low, guest logs are clean. Rebooting the VM or toggling the SET team restores connectivity. Looking for advice on: - Loop‑prevention mechanisms in Hyper‑V SET - How inbound vs outbound flows are balanced - Whether Active‑Standby is possible and how to configure it - Diagnostics to confirm if asymmetric paths or loops are causing the outage Thanks in advance!
HyperV 12 on Windows 2025 ready for production?
Fighting with three HyperV servers in a failover cluster. I understand that now you have to use SET teaming and lbfo is no longer supported. I also understand that SET is still quite buggy. I have created three teams with two adapters in each of them, but it confuses me how they appear in "Network and internet > Ethernet" vs "Advanced Network setting. I have set the vEthernets to the static IPs that I need. But the way the NIC shows up seems random... Some of them shows the IP of the vEthenets and they are all set to DHCP Network seems very unstable if I use more than one NIC in a team. As far as I can google, I am not the only one having these issues. SET networking does not work stable if more than 1 NIC - correct? So if one needs an HA setup - how to handle NIC teaming correct? Can HyperV 12 on Windows 2025 be used in a prof. live setup? thx...
Untagged VLAN - Server 2025 Hyper-V
Hi, I have a strage issue and not finding a solution. Using Server 2025 with two node Hyper-V cluster. Most of the machines using VLANs which works fine. Some machines using no VLAN config. Which usually means the "Access VLAN 1" regarding our switch configuration. With Server 2019 this worked fine. With Server 2025 same NIC port, same server/NIC hardware "Untagged" VMs don't get any network connection. If I add a second NIC to the VM "Untagged" the NIC get immidiatly an IP address and has a proper connection. If I remove the first NIC, the second NIC stop working. It looks like something has changed with Server 2025 (maybe already with Server 2022). Do you have any idea what kinde of problem I have found? Thanks Jack
Dynamic processor compatibility mode
Hi, I was reading up on the new Dynamic processor compatibility mode in 2025 and have been doing some testing and not happy with the result. We have about 400 blades and that comes to about 8 different CPU types in those blades. As our customers have very dynamic demands we're constantly resizing clusters and the blades give me a lot of flexibility in this. In the past the CPU compatibility setting gave us even more flexibility to live migrate between different CPU families, but it also set back the CPU to 1970 levels feature wise. Now with the new updated dynamic processor compatibility mode we have much more CPU functions that are exposed, which is good. The bad thing though is that the CPU level on the cluster is dynamic and my VMs could get different CPU features available with every power off - power on. For example when I start a new cluster with some fresh blades I just received from my supplier, the cluster will determine the common CPU level to be the latest (say XYZ). The VMs I run on it all have CPU compatibility enabled, so they see level XYZ. Now the customer asks for some quick expansion of the cluster and I have to add some older type of blade. My personal testing has learned that the cluster now determines the common level to be somewhat lower, say RST. The VMs that are already running will keep seeing the XYZ (as expected) but: - they can't live migrate to the older host - on next power off and restart, they will go back to level RST. This gives me two major issues. One is that I can't just update my clusters anymore without VM downtime since I can't move VMs to the older hosts. And the bigger issue is that VMs can sometimes have and sometimes not have a specific CPU feature set. Would love to have an option to manually set a CPU feature set for a cluster. I would take my oldest blade, get that feature set and apply it on all clusters and when that blade type is gone, I'd just update all clusters to a new lowest level. Also, I can't find anywhere how I can see through powershell or GUI, what the common CPU feature set for a cluster is. Love to hear everyone's thoughts about this.....Windows Server 2016 | Hyper V VM Network Adapter Issue
Hello, we have had an issue for the past week with our Hyper V virtual machines not receiving internet although being connected to an External Hyper Network Switch. Making sure they had internet, we tried switching the NIC correlated with the External Switch and have still had no luck. These systems are crucial to everyday company productivity so we are trying to avoid reinstalling Hyper V at risk of losing functionality with these VMs, an APP and SQL Server, both the VMs are running on Windows Server 2016 along with the domain controller. The computers in the office are having no trouble connecting to the domain controller it is just when, because of the no network connection, they try and connect to these VMs they have no luck. We are getting a new server next week so any help quickly would be appreciated. Thanks!Hyper-V 2022 - VMSS logs constantly about Hyper-V-VmSwitch
Hi guys, any hyper-v gurus around? I have a new 2022 host which will be deployed to production soon. I've found by luck that vmms process (Virtual Machine Management service) constantly logs Verbose messages about "Ioctl Begin ioctlCode: 0xD15" and " Ioctl End ioctlCode: 0xD15, delta (100 ns): 80, ntStatus: 0x80000005(NT=Buffer Overflow)" with Event ID 0 and source Hyper-V-VmSwitch. I've looked around and had no luck finding the cause. It's happening even if I stop all the VMs and I even removed the vSwitch - there is no vSwitch on the host and it still logs like hell. The source is well know SID 1-5-18 (SECURITY_LOCAL_SYSTEM_RID) Anyone saw this before or have any idea what could be the issue here? Thanks for any ideas Martin
