Hi everyone!
I´m trying to migrate an offline VM from one cluster to another cluster in a different network segment. Firewall rules are correcly configured to allow all traffic, and API Token has admin permissions, but for some reason the establishment of the tunnel is failing.
If I try to run the migration via Proxmox Datacenter Manager v1.1.6, I get this error right at the begining of the process :
2026-07-23 14:31:02 remote: started tunnel worker 'XXXXX'
tunnel: -> sending command "version" to remote
tunnel: <- got reply
2026-07-23 14:31:02 local WS tunnel version: 2
2026-07-23 14:31:02 remote WS tunnel version: 2
2026-07-23 14:31:02 minimum required WS tunnel version: 2
websocket tunnel started
2026-07-23 14:31:02 starting migration of VM 145 to node 'HOST2' (HOST2.domain.local)
tunnel: -> sending command "bwlimit" to remote
tunnel: <- got reply
2026-07-23 14:31:02 found local disk 'ISCSI-DATASTORE:vm-145-disk-0' (attached)
2026-07-23 14:31:02 copying local disk images
tunnel: -> sending command "disk-import" to remote
tunnel: <- got reply
tunnel: accepted new connection on '/run/pve/145.storage'
tunnel: requesting WS ticket via tunnel
tunnel: Tunnel for /run/pve/145.storage failed - client error (SendRequest)
command 'dd 'if=/dev/pxe-archive/vm-145-disk-0' 'bs=64k' 'status=progress'' failed: got signal 13
command 'set -o pipefail && pvesm export ISCSI-DATASTORE:vm-145-disk-0 raw+size - -with-snapshots 0' failed: exit code 255
For the record:
- I have reviewed connectivity and it´s correct.
- Both source and destination LVM volumes are correctly configured in storage.conf file and are capable of storing the same types of data.
- SSH connection from source host to destination one works fine, and viceversa.
- Port 8006 is reachable too. I´m running same OS version in both hosts: pve-manager/9.2.3.
- I have tried differend destination datastores with no difference ( local LVM, iSCSI-based LVM volume, NVME-over-TCP ZFS volume...), same error.
Any idea what could be happening or where to look for the root cause?
Thanks a lot in advance for your help. I don´t know what else to try.
Ginés.
I´m trying to migrate an offline VM from one cluster to another cluster in a different network segment. Firewall rules are correcly configured to allow all traffic, and API Token has admin permissions, but for some reason the establishment of the tunnel is failing.
If I try to run the migration via Proxmox Datacenter Manager v1.1.6, I get this error right at the begining of the process :
2026-07-23 14:31:02 remote: started tunnel worker 'XXXXX'
tunnel: -> sending command "version" to remote
tunnel: <- got reply
2026-07-23 14:31:02 local WS tunnel version: 2
2026-07-23 14:31:02 remote WS tunnel version: 2
2026-07-23 14:31:02 minimum required WS tunnel version: 2
websocket tunnel started
2026-07-23 14:31:02 starting migration of VM 145 to node 'HOST2' (HOST2.domain.local)
tunnel: -> sending command "bwlimit" to remote
tunnel: <- got reply
2026-07-23 14:31:02 found local disk 'ISCSI-DATASTORE:vm-145-disk-0' (attached)
2026-07-23 14:31:02 copying local disk images
tunnel: -> sending command "disk-import" to remote
tunnel: <- got reply
tunnel: accepted new connection on '/run/pve/145.storage'
tunnel: requesting WS ticket via tunnel
tunnel: Tunnel for /run/pve/145.storage failed - client error (SendRequest)
command 'dd 'if=/dev/pxe-archive/vm-145-disk-0' 'bs=64k' 'status=progress'' failed: got signal 13
command 'set -o pipefail && pvesm export ISCSI-DATASTORE:vm-145-disk-0 raw+size - -with-snapshots 0' failed: exit code 255
For the record:
- I have reviewed connectivity and it´s correct.
- Both source and destination LVM volumes are correctly configured in storage.conf file and are capable of storing the same types of data.
- SSH connection from source host to destination one works fine, and viceversa.
- Port 8006 is reachable too. I´m running same OS version in both hosts: pve-manager/9.2.3.
- I have tried differend destination datastores with no difference ( local LVM, iSCSI-based LVM volume, NVME-over-TCP ZFS volume...), same error.
Any idea what could be happening or where to look for the root cause?
Thanks a lot in advance for your help. I don´t know what else to try.
Ginés.
