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Hi, What is the output of `pveversion -v`?

Hi, Thank you for the log you've provided! For more information before I reply the actual reason of the issue cause, could you please provide us the `/etc/pve/corosync.conf` and the network configuration `/etc/network/interfaces` as well as the `ip a` output? This should help us to take an...

Hi, Did you check our wiki guide [0]? If yes, could you please specify what you want help with? This will help us provide you more assistance. [0] https://pve.proxmox.com/wiki/Multipath

Hi, I will try to reproduce the issue on my lab. But could you please confirm if other OS like Debian also have this issue or only on the `Ubuntu 24.04 LTS`?

Hi, Is your Proxmox VE server reachable `172.22.22.200` from another device i.e., from your smartphone or another device (non-VM)? If yes the issue is related to the pfSense configuration (I'm not sure since I don't see all your configuration), but as hint I would also check the pfsense log...

Thank you! Now I would compare the sshd_config file on all nodes: cat /etc/ssh/sshd_config | egrep -iv "#"

Hi, There is nothing in the syslog/journalctl? Could you please run `pvecm updatecerts -f` command on node 1?

Hi, Is the 192.168.100.x is only for the Corosync? or also shared with the VMs and Ceph? May you provide more with syslog entries, this can help us identify what happens exactly.

Hi, What says the output `pvecm status` when only 3 nodes are online? Could you also please provide us with the output of `pveceph status` command.

Do you have a firewall? if yes, could you please temporarily disable it? May you share with us also the output of `ip a` and the network configuration of the Proxmox VE `cat /etc/network/interfaces`.

Okay now could you temporary disable the `split lock` in your Proxmox VE host [0] and see if that fix the issue? Since I see the following in the syslog you've provided when you start the VM: Feb 12 15:40:02 proxmox pvedaemon[90429]: <root@pam> end task...

Thank you for the log! May you try to set the CPU of the 105 VM as `Host`?

Could you please share the VM config and the syslog during the VM start to see if there is anything interesting? What the VM OS Linux or Windows?

You may check the `traceroute` from both clusters. this should give more information.

Could you please check the timedatectl and the `systemctl status chrony` command to see if crony service is installed and active?

Hi, Hard to say without checking the syslog during the time of the failure. Could you please post the syslog?

Hi, Have you checked the syslog during the backup time? Do you see any high I/O during the backup?

Hi, Could you please provide us the test ping of `download.proxmox.com`. Did you edit the `/etc/hosts` file?

Thank you for the syslog and the VM config! It looks like the PCI device is fail to passthrough, could you please check the IOMMU groups to see if all related devices are passed to the VM? find /sys/kernel/iommu_groups/ -type l I would also try to disable power saving by adding...

Yes, exactly! you want traffic from the outside arriving on the physical NIC `enp2s0` to get forwarded into your VM. Also make sure that there is no firewall on both Windows and your PVE.