Failed to get response from NetBackup malware utility

This issue is applicable for scan hosts with RHEL 8.x and NFS version 4.x.

When scanning large backups of 200 million or more files, the following error is displayed on the NetBackup web UI for a failed job:

Failed to get response from NetBackup malware utility.

While a scan is in progress on the scan host, NFS mount points are not accessible from the scan host. The scan job remains in progress and times out after two days. NFS exports on storage server are accessible.

Workaround:

Ensure that you use NFS version 3 for mounting IA mounts on scan host over NFS by setting the following configuration in the /etc/nfsmount.conf file on the scan host:

# grep Defaultvers /etc/nfsmount.conf Defaultvers=3