On attempt to release a node from ACI cluster the error message "Unable to send message to any node in ABGW cluster" is being observed:
Issue in the product.
The issue is permanently fixed in scope of ACI 3.5.1.
For previous version the following workaround is possible:
- Gracefully (without 'Forced release' option) release all disks on the affected node manually in INFRASTRUCTURE > Nodes > <node> > Disks.
- Ensure that all disks on the node are in the Unassigned status and re-attempt node release.
If the issue still persists, contact Acronis support for assistance.