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# pveversion pve-manager/6.4-4/337d6701 (running kernel: 5.4.106-1-pve) I keep getting errors when backing up to CIFS mounted storage. This on dedicated host rented from Hetzner. # cat /etc/pve/storage.cfg dir: local path /var/lib/vz content vztmpl,iso shared 0 zfspool...

Did you use DD mode? Prepare Installation Media If Rufus does not work, try the other methods for preparing USB stick.

Can you restore the missing files from backups?

I suppose people suggest solutions they are familiar with. You may get better answers from more experience admins but my solution: Get server grade host, install Proxmox 6. If you can afford, get two machines so you can cluster two Proxmox hosts and gain some redundancy. If your current host...

My understanding is you can not use LXC Container if that is the case. It just is not possible with a container.

Check what other errors are in /var/log/syslog, about the same time that backup fails. Check other logs if nothing in syslog.

https://pve.proxmox.com/wiki/Storage

Why do you keep doing those commands? They are for corosync upgrade, which you should not do since you are not running corosync. I begin to suspect you have not followed the upgrade instructions properly. Do you have backups of your system? Do you have backups of all virtual machines on this...

Have you rebooted your proxmox host? If you have, and pveversion -v still shows old versions, the upgrade has failed. There should have been messages indicating errors if this is the case. Try doing the upgrade again, carefully following instructions and not install corosync. I just noticed: If...

Are you following https://pve.proxmox.com/wiki/Upgrade_from_5.x_to_6.0 At what step are you now?

Do nothing, just proceed with the upgrade. And run the pve5to6 script. If you have done some corosync configuration, try to undo those.

Are you using Corosync? Do you have a multiserver Proxmox cluster where this is one host? Maybe you do not have Corosync and should not install it at all? Just proceed with the upgrade and leave corosync alone.

On host # pve-firewall status Status: disabled/running What does that mean? Is firewall disabled or running? It can not be both, or can it? I have fail2ban running on host, it has banned lots of IP-numbers so iptables is active on host. I have not done any firewall setup in Proxmox, as far as I...

Your virtual machine must be shutdown to "power off" state, then the new configuration is effective. So shutdown -h or stop it, that should do the trick.

proxmox-ve: 6.3-1 (running kernel: 5.4.103-1-pve) pve-manager: 5.4-15 (running version: 5.4-15/d0ec33c6) pve-kernel-5.4: 6.3-7 pve-kernel-helper: 6.3-7 pve-kernel-5.4.103-1-pve: 5.4.103-1 pve-kernel-4.15: 5.4-19 ... The versions are messed up. Your proxmox-ve is later version than mine, the...

What shows pveversion -v

This used to work, but stopped working on Thursday morning when I rebooted host (and guests). Now mails stay in mailq. I can send e-mails to GMail, though. So port 25 is open to Internet but maybe it is closed between host and guest? I can ping guests. Telnet to guest port 25 outputs "Trying...

Did the upgrade finish without errors? What if you now use command apt dist-upgrade What command is that? Does apt update show everything is updated?

@dcsapak What abaout Devuan 2.1? Devuan ascii If that also works, then the network setup on my host causes this on those kernels. Also, I am testing this on new Proxmox host with no enterprise repo, I have not yet copied the licence key.

No. Tested Debian Stretch with stock kernel, mtr shows packet loss 52%. Installed kernel 4.19 from stretch-backports, after booting with that no packet loss with mtr 1000 run. It looks to me some kernels on guest do not work on curret Proxmox.