Veeam – Unable to allocate processing resources. Error: On-host proxy [HOSTNAME] requires upgrade before it can be used.
As per Oz’s comment below –
1 – Restart the Veeam Backup Service
2 – Restart the Veeam Broker Service
3 – Trigger the backup
I think you will find this is also Veeams solution also…
1 – Restart the Veeam Backup Service
2 – Restart the Veeam Broker Service
3 – Trigger the backup
FIXED