After upgrading to Fangtooth, VMs are not visible even though they are running

[Patrick]

I had Electric Eel 24.10.3 and held out on upgrading to Fangtooth because I have several important VMs. Now that classic virtualization has been restored to Fangtooth, I upgraded to Fangtooth 25.04.2.

After upgrading, the VMs are not visible under the virtualization tab, but they are running, as I can ping them, and they fulfill their roles like SAMBA, etc. They’re just not visible in the Truenas UI.

I have included a screenshot of the virtualization tab after the upgrade. If anyone has suggestions as to how to fix this, I would appreciate it. In the meantime, I have downgraded back to Electric Eel by booting to 24.10.3 so that I can see and configure the VMs, but I would like to get back to Fangtooth.

[SmallBarky]

Refer to the announcements section on the upgrade and the release notes for updates

[Stux]

HOWTO: Fix Virtual Machines: Cannot Retrieve Response in 25.04.2

The bug in 25.04.2 that causes the Virtual Machines page to error with “Cannot Retrieve Response” has been fixed for a future 25.04.2.1 release already, but the fix can be easily applied to a 25.04.2 installation. WARNING: ONLY USE THIS ON 25.04.2! In the shell, switch to root, if you are not root already sudo su remove the readonly protection on /usr zfs set readonly=off "$(zfs list -H -o name /usr)" use the following command to apply this patch to fix this issue (this will backup the mod…

[Patrick]

Thanks. I didn’t know about this bug. There is no pressing need for me to upgrade, so I’ll stay with Electric Eel until 25.04.2.1 comes out.

[davistw]

Simply go to the VM and make sure the “display” configuration has a password assigned to it for all your VM’s then do the upgrade. Under EEL, go to the virtual machine setting. Go to devices/Display and make sure it has a password assigned. Set them all with a display password and then do the upgrade… Bobs your Uncle…

[Patrick]

@davistw

Simply go to the VM and make sure the “display” configuration has a password assigned to it for all your VM’s then do the upgrade. Under EEL, go to the virtual machine setting. Go to devices/Display and make sure it has a password assigned. Set them all with a display password and then do the upgrade… Bobs your Uncle…

Thanks. That sounds like the solution.

[Patrick]

@davistw

Simply go to the VM and make sure the “display” configuration has a password assigned to it for all your VM’s then do the upgrade. Under EEL, go to the virtual machine setting. Go to devices/Display and make sure it has a password assigned. Set them all with a display password and then do the upgrade

For the record, this didn’t work for me. I added passwords in the display device for the VMs that lacked them, but it still says “Can not retrieve response” and fails to show any VMs when I boot into 25.04.2.

I realize there is a patch to fix this, but I don’t like messing with patches in the CLI unless I have to, and there is nothing urgent about the need to upgrade to Fangtooth. So, I will stay with Electric Eel until 25.04.02.1 comes out, which will apparently incorporate the patch and fix the problem.

[davistw]

Did you do a whole new upgrade after you fixed the passwords or just boot into the previous failed upgrade attempt? The problem is in the upgrade code. What you have to do is delete the bad boot and do a re-upgrade that way it will build the OS correctly.

[Patrick]

I have finally gotten this working. The solution was to add passwords to the display device for any VMs that were missing them. But then, since I originally upgraded to 25.04.02 with VMs that lacked display device passwords, I had to delete the failed upgrade to 25.04.02 from “Boot Environments” (which required first activating 24.10.3 as the default boot environment). Then, I re-upgraded to 25.10.02, and the VMs were visible under the Virtual Machines tab.