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:
- Port 22
- Port 80 and 443 (if not customized, use the default ports)
- 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" ...
Troubleshooting Guide: SG0147/SG0136 - Unable to Connect to the Backup Server
KB ID: 115098 Cause: This error typically occurs under the following circumstances: 1. The client is unable to connect to the BDR Server backup port (default 32004). 2. VembuBDR services are not running on the server machine. 3. The backup port ...
SG0083: Error - Unable to Send Backup Details to Server
KB ID: 115109 Cause: When performing backup jobs, the error "Unable to send backup details to server" may occur. This error is typically associated with large backup data sizes or unstable network connectivity. Solution: To address this issue, please ...
VMware Backup Fails Due to Special/Unicode Characters in VM and Datastore Names
KB ID: 58 Cause: The backup failure issue arises when vSphere entities such as virtual machine names, cluster names, datastore/folder/file names, etc., contain special characters like %, &, *, $, #, @, !, \, /, :, *, ?, “”, <, >, |, ;, ‘, etc. ...
VMware Backup Failure: Unable to Retrieve queryChangedDiskAreas
KB ID: 105017 Issue: During VMware backups, encountering the error message "Unable to retrieve queryChangedDiskAreas even after CBT query retry" indicates a failure to track Changed Blocks of a virtual machine (VM) within BDRSuite. Cause: The error ...