Applies to ONTAP 9 NDMP Veeam Issue Firewall rules block ports for nmdp data connections. Error messages of Cannot connect to ndmp-server socket can be observed from Veeam software log. Example: Full ...Applies to ONTAP 9 NDMP Veeam Issue Firewall rules block ports for nmdp data connections. Error messages of Cannot connect to ndmp-server socket can be observed from Veeam software log. Example: Full backup: Cannot connect to ndmp-server socket. --tr:Failed to create NDMP data reader for host: 'x.x.x.x', port: '10000' Couldn't create ndmpReader