Sauvegardes VMware via NBD échouent avec: NBD_ERR_NETWORK_CONNECT - Error 13 "You do not have access rights to this file" (4042991)

Les sauvegardes VMware échouent constamment avec les erreurs suivantes:

"Failed to open virtual disk"

CONTEXT:

[13] You do not have access rights to this file

Les logs VDDK montrent:

VDDK: Cnx_Connect: Error message: Failed to connect to server esxi1.local:902

VDDK: NBD_ClientOpen: Couldn't connect to esxi1.local:902 Failed to connect to server esxi1.local:902

VDDK: DISKLIB-DSCPTR: : "vpxa-nfc://[datastore1] vm1/vm1-000002.vmdk@esxi1.local:902" : Failed to open NBD extent.

VDDK: DISKLIB-LINK  : "vpxa-nfc://[datastore1] vm1/vm1-000002.vmdk@esxi1.local:902" : failed to open (NBD_ERR_NETWORK_CONNECT).  

VDDK: DISKLIB-CHAIN : "vpxa-nfc://[datastore1] vm1/vm1-000002.vmdk@esxi1.local:902" : failed to open (NBD_ERR_NETWORK_CONNECT).

VDDK: DISKLIB-LIB   : Failed to open 'vpxa-nfc://[datastore1] vm1/vm1-000002.vmdk@esxi1.local:902' with flags 0x1e NBD_ERR_NETWORK_CONNECT (2338).

VDDK: VixDiskLib: Unable to locate appropriate transport mode to open disk. Error 13 (You do not have access rights to this file) at 4905.

VDDK: VixDiskLib: VixDiskLib_OpenEx: Cannot open disk [datastore1] vm1/vm1-000002.vmdk. Error 13 (You do not have access rights to this file) at 5026.

VDDK: VixDiskLib: VixDiskLib_Open: Cannot open disk [datastore1] vm1/vm1-000002.vmdk. Error 13 (You do not have access rights to this file) at 5064.

Failed to open vmdk

De plus un telnet du esxi sur le port 902 échoue aussi.