Hello -
From reading the information you provided, my initial guess is that you might be encountering the issue described here:
If that is not the cae, when you start a backup job, there should be a log created in the /usr/local/avamarclient/var-proxy-? subdirectories. The log file will be named based on the name of the backup job.
If you are able to grab that log and either send to me via PM or append here, then I can look further.
Otherwise, if you want, you can collect the log file bundle from the VDP-configure UI and submit a support case with VMware support.
Thanks,