The server refused connection

Hi, after upgrade Acronis form 12.5 to 15.0.27009 more than half plans stop working and have a lot of this kind error (below). Do anyone know what have I supposed to do to fix this issue?
Error code: 20250646
Fields: {"$module":"service_process_vsa64_27009","CommandID":"8F01AC13-F59E-4851-9204-DE1FD77E36B4"}
Message: TOL: Failed to execute the command. Backing up
------------------------
Error code: 20250646
Fields: {"$module":"gtob_backup_command_addon_vsa64_27009","CommandID":"8F01AC13-F59E-4851-9204-DE1FD77E36B4"}
Message: TOL: Failed to execute the command. Backing up
------------------------
Error code: 7503931
Fields: {"$module":"disk_bundle_vsa64_27009"}
Message: Backup of virtual machines has failed.
------------------------
Error code: 7503950
Fields: {"$module":"disk_bundle_vsa64_27009"}
Message: Not all virtual machines have been backed up.
------------------------
Error code: 7503949
Fields: {"$module":"disk_bundle_vsa64_27009"}
Message: Failed to back up virtual machine 'xxx-TMS-NAV'.
------------------------
Error code: 7503890
Fields: {"$module":"disk_bundle_vsa64_27009"}
Message: Failed to prepare for backup.
------------------------
Error code: 21561347
Fields: {"$module":"disk_bundle_vsa64_27009"}
Message: Backup has failed.
------------------------
Error code: 66596
Fields: {"$module":"disk_bundle_vsa64_27009"}
------------------------
Error code: 9764877
Fields: {"$module":"disk_bundle_vsa64_27009"}
Message: Failed to perform the requested operation.
------------------------
Error code: 7503875
Fields: {"$module":"disk_bundle_vsa64_27009"}
Message: Failed to prepare for backup.
------------------------
Error code: 5439582
Fields: {"$module":"esx_srv_vsa64_27009"}
Message: Failed to open virtual disk file '[xxxx1] xxx-TMS-NAV/xxx-TMS-NAV-000002.vmdk'.
------------------------
Error code: 14009
Fields: {"$module":"esx_srv_vsa64_27009"}
Message: The server refused connection
------------------------

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Hello, I have the same problem but is a new Acronis installation.
I explain the stage:
It's an Acronis Cyber Protect 15 Backup Advanced Virtual Host installation.
Acronis console is installed in a virtual machine Windows server 2016 standard, in a workgroup.
Acronis Cyber Protect has been installed with default services accounts.
It has been deployed VMWare Appliance in one host ESXi.
Appliance Configuration has the credentials for the vcenter administrator account, the credentials for the Acronis Management Server and TCPIP Configuration.
Apparently Communication between the AMS & the Appliance seems to work fine as all the ESXi hosts and VMs appear in Acronis console.
Ports 443 and 902 has been opened between VMware Appliance and VMware VCenter.
iSCSI NAS Storage has been configured in VCenter as datastore, and set in Acronis Virtual Machine as another hard disk (secondary local drive in ms explorer).
I have created two protection copy plans (destiny \\acronis_vm\secondary_drive with Acronis VM credentials) and when running the plan, the backup failed.
I do not see any blocked traffic in the firewall.
Can you give any idea?
Reinstaling the you re-install Virtual Appliance (Agent for VMware) on the ESXi host is the solution?
Thank you and regards
MESSAGE
The server refused connection
Additional info:
------------------------
Error code: 20250646
Fields: {"$module":"mms_bundle_glxa64_28035","CommandID":"D332948D-A7A9-4E07-B76C-253DCF6E17FB"}
Message: TOL: Failed to execute the command. Backup plan 'Plan de prueba'
------------------------
Error code: 20250646
Fields: {"$module":"mms_bundle_glxa64_28035","CommandID":"D332948D-A7A9-4E07-B76C-253DCF6E17FB"}
Message: TOL: Failed to execute the command. Backup plan 'Plan de prueba'
------------------------
Error code: 20119593
Fields: {"$module":"mms_bundle_glxa64_28035"}
Message: Failed to execute the command.
------------------------
Error code: 20250677
Fields: {"$module":"mms_bundle_glxa64_28035","FailCount":2}
Message: 2 activities have not succeeded. One of them is displayed.
------------------------
Error code: 20250646
Fields: {"$module":"service_process_glxa64_28035","CommandID":"8F01AC13-F59E-4851-9204-DE1FD77E36B4"}
Message: TOL: Failed to execute the command. Backing up
------------------------
Error code: 20250646
Fields: {"$module":"gtob_backup_command_addon_glxa64_28035","CommandID":"8F01AC13-F59E-4851-9204-DE1FD77E36B4"}
Message: TOL: Failed to execute the command. Backing up
------------------------
Error code: 7503931
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Backup of virtual machines has failed.
------------------------
Error code: 7503950
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Not all virtual machines have been backed up.
------------------------
Error code: 7503949
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Failed to back up virtual machine 'nmaad01-PRUEBASPARCHEO'.
------------------------
Error code: 7503890
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Failed to prepare for backup.
------------------------
Error code: 21561347
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Backup has failed.
------------------------
Error code: 66596
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
------------------------
Error code: 9764877
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Failed to perform the requested operation.
------------------------
Error code: 7503875
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Failed to prepare for backup.
------------------------
Error code: 5439582
Fields: {"$module":"esx_srv_glxa64_28035"}
Message: Failed to open virtual disk file '[genvm01-Vol] nmaad01/nmaad01-000002.vmdk'.
------------------------
Error code: 14009
Fields: {"$module":"esx_srv_glxa64_28035"}
Message: The server refused connection
------------------------
MESSAGE
You do not have access rights to this file
Additional info:
------------------------
Error code: 20250646
Fields: {"$module":"mms_bundle_glxa64_28035","CommandID":"D332948D-A7A9-4E07-B76C-253DCF6E17FB"}
Message: TOL: Failed to execute the command. Backup plan 'Prueba 2'
------------------------
Error code: 20250646
Fields: {"$module":"mms_bundle_glxa64_28035","CommandID":"D332948D-A7A9-4E07-B76C-253DCF6E17FB"}
Message: TOL: Failed to execute the command. Backup plan 'Prueba 2'
------------------------
Error code: 20119593
Fields: {"$module":"mms_bundle_glxa64_28035"}
Message: Failed to execute the command.
------------------------
Error code: 20250677
Fields: {"$module":"mms_bundle_glxa64_28035","FailCount":2}
Message: 2 activities have not succeeded. One of them is displayed.
------------------------
Error code: 20250646
Fields: {"$module":"service_process_glxa64_28035","CommandID":"8F01AC13-F59E-4851-9204-DE1FD77E36B4"}
Message: TOL: Failed to execute the command. Backing up
------------------------
Error code: 20250646
Fields: {"$module":"gtob_backup_command_addon_glxa64_28035","CommandID":"8F01AC13-F59E-4851-9204-DE1FD77E36B4"}
Message: TOL: Failed to execute the command. Backing up
------------------------
Error code: 7503931
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Backup of virtual machines has failed.
------------------------
Error code: 7503950
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Not all virtual machines have been backed up.
------------------------
Error code: 7503949
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Failed to back up virtual machine 'TEST_ALMACENAMIENTO2'.
------------------------
Error code: 7503890
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Failed to prepare for backup.
------------------------
Error code: 21561347
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Backup has failed.
------------------------
Error code: 66596
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
------------------------
Error code: 9764877
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Failed to perform the requested operation.
------------------------
Error code: 7503875
Fields: {"$module":"disk_bundle_tape_off_glxa64_28035"}
Message: Failed to prepare for backup.
------------------------
Error code: 5439582
Fields: {"$module":"esx_srv_glxa64_28035"}
Message: Failed to open virtual disk file '[datastore1] TEST_ALMACENAMIENTO2/TEST_ALMACENAMIENTO2.vmdk'.
------------------------
Error code: 13
Fields: {"$module":"esx_srv_glxa64_28035"}
Message: You do not have access rights to this file
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Hello Jose Carballido!
Your question is answered in the neighbor forum thread https://forum.acronis.com/forum/acronis-cyber-protect-15-forum/vmware-virtual-appliance-backup-plan-failed
Please check whether \\acronis_vm is accessible from the AMS machine at the moment of protection plan creation.
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