Sometimes the NFC service on the host itself becomes unresponsive. Failed to create NFC download stream - Veeam R&D Forums
Veeam Proxies must be able to resolve the FQDN of the ESXi hosts as they are registered in vCenter. Sometimes the NFC service on the host itself
If DNS is unreliable, manually add the ESXi host's IP and hostname to the C:\Windows\System32\drivers\etc\hosts file on the Veeam Proxy . 3. ESXi Management Agents Some advanced firewalls may incorrectly flag compressed or
From the proxy server, try to ping the ESXi host by the name shown in the vCenter inventory. DNS Resolution Issues
The error in Veeam Backup & Replication typically indicates a network connectivity or communication failure between the Veeam Backup Proxy and the ESXi host holding the virtual machine data .
Some advanced firewalls may incorrectly flag compressed or encrypted Veeam data as a threat, terminating the connection. Consult Veeam KB2140 if you suspect signature-based blocking. 2. DNS Resolution Issues