Hyper-V Ubuntu VM: Memory Demand Different at Hyper-V and OS Level
Hello all, Looking for advice and insight for a strange problem we are experiencing. We have a cluster of Windows Server 2025 hosts, on which we are using Hyper-V manager to run mostly Windows VMs. To access these VMs, we are using Apache Guacamole which is hosted on a Ubuntu VM on our cluster. We originally assigned 32GB memory to this VM. Recently, we have noticed an increased memory demand for this VM at the Hyper-V level which prompted us to increase the assigned memory of the VM to 64GB. Despite this, the memory demand has continued rising despite no apparent change in the usage of Guacamole. When logging into the VM and observing the memory usage here, the VM is using no where near the amount that is assigned. As shown in the attached images which were taken at the same time: Memory Demand Hyper-V Level (And seems to be continuing to increase...): Memory Demand OS Level: This morning, the memory demand spiked to 95GB on Hyper-V but at OS level was only 12GB and we were forced to restart the VM. The biggest concern is where this discrepancy is coming from and the potential unnecessary disruptions that will be caused from having to restart/rebuild the VM. Has anyone experienced this sort of issue before and found a fix? Can anyone suggest how to debug this issue? TIA
Windows Server 2025 Standard - failing to load sign in screen
Hello all Has anyone come across an issue with login into their Win Svr 2025 Standard via the GUI or RDP? Had a good google and can't see much of info out there but since last week I lost the ability to RDP or even locally sign into my server running Hyper-V, VMs work fine. When connecting via RDP the session is initiated - get past credential prompt and cert warning but never gets to establish the session. Since the server is hosted on prem, I was able to pop down to the comms room but when I tried to login via GUI after hitting Ctrl+Alt+Del loading screen comes up but never follows through to display username and password textboxes. Since this is a production system I can't just reboot the whole lot. In the meantime, I've tried restarting both WinLogon.exe and LogonUI.exe processes via CIMSession both were showing twice and after terminating each the number of processes come down to 1 but still no joy signing in. Any ideas community? New to the community so apologies in advance if I posted in the wrong place. Best wishes Michal
¿Cómo podemos mejorar la seguridad de un servidor Windows Server 2025?
Hola, tengo una duda sobre la seguridad en Windows Server 2025. ¿Qué medidas recomendáis para proteger un servidor frente a accesos no autorizados? Por ejemplo, ¿es suficiente con configurar el Firewall de Windows y utilizar políticas de contraseñas, o sería recomendable añadir otras medidas como MFA, auditorías y políticas de grupo (GPO)?
Hyper-v Ubuntu 26.04LTS Multiple DHCP entries
Good evening, am running windows server 2022 datacenter edition, which is running multiple hyper-v machines. I have been installing a new instance of ubuntu 26.04.1LTS but have noticed something weird. Maybe you could assist. Issue: When fresh install Ubuntu 26.04.1 into a VM using hyper-v, I notice 2 IP addresses appear in windows DHCP (192.168.40.20, 192.168.40.21). When I shut down the instance only one disappears (192.168.40.21). If I delete 192.168.40.20 and restart the VM instance both Ip addresses reappear in DHCP. Points to note: Image was downloaded direct off the website with no changes (have redownloaded to make sure image is not broken) Have tried using a different name for the server Have noticed the ubuntu instance only picks up one address (192.168.40.21) for the adaptor. Am unable to ping 192.168.40.20 or connect to that address via ssh. Would anyone have any idea, where the second IP address would be coming from in DHCP?
Assign IP Address for Windows Server 2025 VM on Hyper-V
I have built my first Windows Server 2025 VM on HyperV and trying to assign an IP address. I want the VM's to be like an actual server so I Created an external vswitch. The HyperV server IP is 172.16.1.41 with a physical gateway of 172.16.1.5. I have tried to assign the new VM with 172.16.1.42/255.255.255.0 and the Gateway is 172.16.1.5 also. However, I cannot get a positive ping. Do I need another VSWITCH configured or what am I missing?Windows Server 2022 Hyper-V : vmconnect introuvable pour accéder à la console VM (Server Core)
Contexte Windows Server 2022 [Standard/Datacenter — à préciser], rôle Hyper-V installé. J'ai créé une VM invitée Linux nommée « Wazuh » (installation d'une plateforme SIEM), elle démarre correctement. ce serveur est une VM imbriquée dans un autre hyperviseur type VMware Workstation. je suis en simple groupe de travail (workgroup). Ce que je constate PS C:\Users\Administrator> Start-VM -Name 'Wazuh' PS C:\Users\Administrator> vmconnect localhost Wazuh vmconnect : The term 'vmconnect' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again. At line:1 char:1 + vmconnect localhost Wazuh + ~~~~~~~~~ + CategoryInfo : ObjectNotFound: (vmconnect:String) [], CommandNotFoundException + FullyQualifiedErrorId : CommandNotFoundException PS C:\Users\Administrator> Get-VM -Name 'Wazuh' | Select-Object State, Status State Status ----- ------ Running Operating normally PS C:\Users\Administrator> vmconnect localhost Wazuh vmconnect : The term 'vmconnect' is not recognized as the name of a cmdlet, function, script file, or operable program... La VM est bien « Running / Operating normally » selon Get-VM, donc le souci n'est pas la VM elle-même mais l'accès à sa console. Ce que j'ai déjà essayé Get-WindowsFeature *Hyper-V* → [colle ici la sortie exacte que tu as obtenue] Install-WindowsFeature -Name RSAT-Hyper-V-Tools -IncludeAllSubFeature → toujours pas de vmconnect.exe fonctionnel après coup Je soupçonne que ce serveur est installé en mode Server Core (pas d'interface graphique locale), et j'ai lu que la conversion Core → Desktop Experience n'est plus possible après coup depuis Server 2016. Ma question pour la communauté Est-il vraiment impossible d'obtenir une console graphique locale (vmconnect / Hyper-V Manager) sur un Server Core, même une fois les outils de gestion Hyper-V installés ? Quelle est la méthode la plus fiable pour accéder à la console d'une VM Hyper-V hébergée sur un Server Core, en environnement non-domaine (workgroup) : Windows Admin Center, Hyper-V Manager distant (config WinRM/TrustedHosts), ou faut-il simplement réinstaller en Desktop Experience ? Si quelqu'un a déjà mis en place Windows Admin Center ou du Hyper-V Manager distant sur un lab en groupe de travail (sans AD), un retour d'expérience serait très utile. Merci d'avance !
Hyper-V Converged Networking for VEEAM Backups
Hi All, As per the image below, I have 3 x HPE DL380 Gen 12 Servers, Server1 and Server2 are ADDS domain joined, VEEAM Local Repo is not. For the converged networking to work, is there anything else I need to perform in terms of additional power-shell commands, VLAN tagging etc? Thanks!
Unable to Build Switchless Storage using Network ATC
3-Node HV/S2D Cluster using Switchless Storage and Network ATC getting Network HUD Error I have a Dell 3-node server cluster being used to host Hyper-V with S2D. Each node is identical and certified to pass S2D requirements. The networking consists of 2 onboard 1 Gbps and 2 quad-port PCI(e) NICs at 10/25 Gbps. The 2 onboard ports are being used for the management intent, 2 ports from each of those NICs are being connected to 2 top-of-rack switches for the compute intent at a total of 12 10 Gbps connections, and the other 2 ports from each of those NICs are being connected directly to the other nodes in a dual mesh method for the storage intent at a total of 6 25 Gbps connections. Very similar to the Microsoft diagram for a three-node storage switchless, dual TOR, dual link deployment network reference pattern for Azure Local, but I am using Windows Server 2025 Datacenter, not Azure Local. The problem I am encountering is when I attempt to create the switchless storage intent, I get an error (shown below) that reads "Failed to fetch physical NIC mapping from the Network HUD service. Please diagnose..." If I leave off the switchless option, it builds without issue. The error only occurs when I attempt to use the switchless option. I tried without configuring the NIC IP addresses first, as well as trying configuring the NIC IP addresses beforehand. I tried without having a cluster built first, as well as building a failover cluster without storage before running the network intent command. The error I posted below shows my last attempt after having the NICs configured with IP addresses and having a failover cluster established before running the command. The error has remained the same throughout the process. Has anyone else run into an issue like this with switchless storage? It seems like everything that I am trying to do is within scope and should be a supported solution. My fallback plan is to use my existing switches, but that drops my connection speeds down from 25 Gbps to 10 Gbps due to hardware limitations.Windows Server 2025 Failover Cluster Live Migration Issue
Hi Everyone, I am facing an issue in a Hyper-V Failover Cluster environment where Live Migration intermittently fails due to a service logon-related problem. The environment was previously working normally, but now whenever we attempt to Live Migrate a VM between cluster nodes, the migration fails unless we manually run “gpupdate /force” on the Hyper-V host first. After running gpupdate /force, the migration works temporarily, but the issue returns again during the next migration attempt. This makes it appear that some policy or permission is not being applied consistently on the cluster nodes. During troubleshooting, I attempted to add “NT VIRTUAL MACHINE\Virtual Machines” to the “Log on as a service” policy under Local Security Policy > Local Policies > User Rights Assignment. However, the account does not appear or resolve in the Object Picker when trying to add it manually. At this stage, I am trying to understand whether this is related to a domain GPO overwriting local policy settings, a Failover Cluster permission issue, or something specific to Hyper-V virtual machine accounts. Has anyone encountered a similar issue where Live Migration only works after running gpupdate /force? Also, is there a correct method to add “NT VIRTUAL MACHINE\Virtual Machines” to the “Log on as a service” policy, or should this permission already exist by default on Hyper-V hosts? Any guidance or recommendations would be greatly appreciated.
