[TUTORIAL] VM power off when migrate vm with error " tunnel replied"

[tikerbell]

I have two Promox nodes installed. I've configured the network on both nodes identically. However, when I migrate a VM for the first time from node 1 to node 2 or vice versa, I always get a "Tunnel replied" error as shown in the image below, and the VM powers off at the destination node. After I power on the VM and migrate in the opposite direction, there is no downtime. Can someone please explain this to me?

2026-02-10 23:36:54 starting migration of VM 106 to node 'promox01' (192.168.1.5)
2026-02-10 23:36:54 starting VM 106 on remote node 'promox01'
2026-02-10 23:36:57 start remote tunnel
2026-02-10 23:36:58 ssh tunnel ver 1
2026-02-10 23:36:58 starting online/live migration on unix:/run/qemu-server/106.migrate
2026-02-10 23:36:58 set migration capabilities
2026-02-10 23:36:58 migration downtime limit: 100 ms
2026-02-10 23:36:58 migration cachesize: 2.0 GiB
2026-02-10 23:36:58 set migration parameters
2026-02-10 23:36:58 start migrate command to unix:/run/qemu-server/106.migrate
2026-02-10 23:36:59 migration active, transferred 289.5 MiB of 16.0 GiB VM-state, 6.5 GiB/s
2026-02-10 23:37:00 migration active, transferred 304.2 MiB of 16.0 GiB VM-state, 6.6 GiB/s
2026-02-10 23:37:01 migration active, transferred 420.8 MiB of 16.0 GiB VM-state, 598.1 MiB/s
2026-02-10 23:37:02 migration active, transferred 1.1 GiB of 16.0 GiB VM-state, 754.9 MiB/s
2026-02-10 23:37:03 average migration speed: 3.2 GiB/s - downtime 40 ms
2026-02-10 23:37:03 migration completed, transferred 1.4 GiB VM-state
2026-02-10 23:37:03 migration status: completed
2026-02-10 23:37:03 ERROR: tunnel replied 'ERR: resume failed - VM 106 not running' to command 'resume 106'
2026-02-10 23:37:03 stopping migration dbus-vmstate helpers
2026-02-10 23:37:03 migrated 0 conntrack state entries
400 Parameter verification failed.
node: VM 106 not running locally on node 'promox01'
proxy handler failed: pvesh create <api_path> --action <string> [OPTIONS] [FORMAT_OPTIONS]
2026-02-10 23:37:05 failed to stop dbus-vmstate on promox01: command 'pvesh create /nodes/promox01/qemu/106/dbus-vmstate --action stop' failed: exit code 2
2026-02-10 23:37:05 flushing conntrack state for guest on source node
2026-02-10 23:37:07 ERROR: migration finished with problems (duration 00:00:13)
TASK ERROR: migration problems

 

[fstrankowski]

• Which CPU type did you chose for your VM? Did you set it host by any chance?
• Are the two nodes 100% CPU identical?

If not, please change the CPU type of the VM to AES-v2 and try again.

 

[tikerbell]

Thanks for your reply:

• Which CPU type did you chose for your VM? Did you set it host by any chance? => my VM CPU setting x86-64-v2 AES
• Are the two nodes 100% CPU identical? => two nodes 10% CPU usage

• Which CPU type did you chose for your VM? Did you set it host by any chance?
• Are the two nodes 100% CPU identical?

If not, please change the CPU type of the VM to AES-v2 View attachment 95756 and try again.

 

[tikerbell]

• Which CPU type did you chose for your VM? Did you set it host by any chance?
• Are the two nodes 100% CPU identical?

If not, please change the CPU type of the VM to AES-v2 View attachment 95756 and try again.

What other factors could be causing this error?

 

[fstrankowski]

Tough question. This was the one coming to my mind which could cause said issue. Are there any traces you can supply with the error message?