VMware Backup Fails with NBD_ERR_NETWORK_CONNECT Error

VMware Backup Fails with NBD_ERR_NETWORK_CONNECT Error

KB ID: 115056  
Cause:
The "NBD_ERR_NETWORK_CONNECT" error occurs when the ESXi/vCenter network experiences instability during VMware backup, replication, or recovery while attempting to read the VM’s disk data.
Solution:
Follow these steps to troubleshoot and resolve the issue:
1. Check the nslookup of the ESXi server from the BDRSuite agent and vice-versa.
2. Verify if you can telnet to port 902 of the ESXi server from both the BDRSuite agent and vCenter.
3. Examine the network connectivity of the ESXi host.
4. Ensure that the TCP ports required for the VMware agent are not blocked. Open the following TCP ports in the hypervisor:
  1. Port 22
  2. Port 80 and 443 (if not customized, use the default ports)
  3. Port 902
Additionally:
Confirm that the datastore (iSCSI, NFS) added to the ESXi host has stable network connectivity from the host.
If the issue persists despite the above steps, please contact BDRSuite support, providing the backup log and vSphere log of the job for further assistance.
    • Related Articles

    • VMware Backup Failed with NBD_ERR_NETWORK_CONNECT Error

      KB ID: 115056 Cause: The error "NBDERRNetwork_Connect" occurs when there is instability in the ESXi/vCenter network during VMware backup/replication/recovery while attempting to read VM’s disk data. Solution: To resolve the "NBD_ERR_NETWORK_CONNECT" ...
    • Adding VMware ESXi & vCenter Server for Backup (Remote Network)

      Prerequisites The VMware ESXi or vCenter Server you want to add should be of Licensed Edition The VMware ESXi or the vCenter Server should be v4.0 & above Adding VMware ESXi/vCenter host Remote Network Step 1: Log in to your backup server machine and ...
    • Adding VMware ESXi & vCenter Server for Backup (Local Network)

      You need to add the VMware ESXi/vCenter Server containing the VMs to the production infrastructure of the BDRSuite Backup Server before starting to configure a backup job. Prerequisites The VMware ESXi or vCenter Server you want to add should be of ...
    • Adding VMware ESXi & vCenter Server for Backup (Local Network)

      You need to add the VMware ESXi/vCenter Server containing the VMs to the production infrastructure of the BDRSuite Backup Server before starting to configure a backup job. Prerequisites The VMware ESXi or vCenter Server you want to add should be of ...
    • Quick Start Guide for VMware Backup & Replication

      About VMware Backup & Replication BDRSuite offers a robust solution for protecting VMware vSphere virtual machines with features like agentless, image-level backups, CBT for incremental backups, and application-aware processing. It supports granular ...