Avamar 虚拟机映像备份失败，并显示错误消息：“NBD_ERR_NETWORK_CONNECT”

Summary: 虚拟机备份失败，并显示如下错误消息：“无法打开'vpxa-nfcssl：//[] /.vmdk@：902' with flags 0x1e NBD_ERR_NETWORK_CONNECT （2338）”

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Symptoms



  • 虚拟机备份失败，并显示以下错误： 
2015-11-18 09:44:15 avvcbimage Info <16041>: VDDK:DISKLIB-LIB   : Failed to open 'vpxa-nfcssl://[<Datastore_Name>] <VM_Name>/<VM_Name>.vmdk@<esx_name>.com:902' with flags 0x1e NBD_ERR_NETWORK_CONNECT (2338). 
2015-11-18 09:44:15 avvcbimage Info <16041>: VDDK:NBD_ClientOpen: attempting to create connection to vpxa-nfc://[<Datastore_Name>] <VM_Name>/<VM_Name>.vmdk@<esx_name>:902
2015-11-18 09:44:15 avvcbimage Info <16041>: VDDK:CnxAuthdConnect: Returning false because CnxAuthdConnectTCP failed 2015-11-18 09:44:15 avvcbimage Info <16041>: VDDK:CnxConnectAuthd: Returning false because CnxAuthdConnect failed
2015-11-18 09:44:15 avvcbimage Info <16041>: VDDK:Cnx_Connect: Returning false because CnxConnectAuthd failed
2015-11-18 09:44:15 avvcbimage Info <16041>: VDDK:Cnx_Connect: Error message: Host address lookup for server esx-dc-ams003.avg.com failed: Name or service not known 2015-11-18 09:44:15 avvcbimage Warning <16041>: VDDK:[NFC ERROR] NfcNewAuthdConnectionEx: Failed to connect to peer. Error: Host address lookup for server esx-dc-ams003.avg.com failed: Name or service not known
2015-11-18 09:44:15 avvcbimage Info <16041>: VDDK:NBD_ClientOpen: Couldn't connect to esx-dc-ams003.avg.com:902 Host address lookup for server esx-dc-ams003.avg.com failed: Name or service not known
2015-11-18 09:44:15 avvcbimage Info <16041>: VDDK:DISKLIB-DSCPTR: : "vpxa-nfc://[<Datastore_Name>] <VM_Name>/<VM_Name>.vmdk@<esx_name>:902" : Failed to open NBD extent.
2015-11-18 09:44:15 avvcbimage Info <16041>: VDDK:DISKLIB-LINK  : "vpxa-nfc://[<Datastore_Name>] <VM_Name>/<VM_Name>.vmdk@<esx_name>:902" : failed to open (NBD_ERR_NETWORK_CONNECT). 
2015-11-18 09:44:15 avvcbimage Info <16041>: VDDK:DISKLIB-CHAIN : "vpxa-nfc://[<Datastore_Name>] <VM_Name>/<VM_Name>.vmdk@<esx_name>:902" : failed to open (NBD_ERR_NETWORK_CONNECT).
2015-11-18 09:44:15 avvcbimage Info <16041>: VDDK:DISKLIB-LIB   : Failed to open 'vpxa-nfc://[<Datastore_Name>] <VM_Name>/<VM_Name>.vmdk@<esx_name>:902' with flags 0x1e NBD_ERR_NETWORK_CONNECT (2338).
2015-11-18 09:44:15 avvcbimage Error <0000>: [IMG0008] Failed to connect to virtual disk [<Datastore_Name>] <VM_Name>/<VM_Name>.vmdk (13) (13) You do not have access rights to this file
2015-11-18 09:44:15 avvcbimage Info <19644>: Connecting virtual disk [san_storage_dc_ams_00_web] <VM_Name>/<VM_Name>.vmdk
2015-11-18 09:44:15 avvcbimage Error <0000>: [IMG0008] VixDiskLib_Open([<Datastore_Name>] <VM_Name>/<VM_Name>.vmdk) returned (13) You do not have access rights to this file
2015-11-18 09:44:15 avvcbimage Info <9772>: Starting graceful (staged) termination, VixDiskLib_Open attempt to connect to virtual disk failed (wrap-up stage)
2015-11-18 09:44:15 avvcbimage Info <16052>: Terminating backup of all remaining virtual disks

 

Cause

  • 代理在端口 902 上连接到 esx，但它多次尝试连接到虚拟机磁盘，但由于网络问题（即数据包丢弃）而失败，并显示以下错误：    
2015-11-18 09:44:15 avvcbimage Info <16041>: VDDK:DISKLIB-LIB   : Failed to open 'vpxa-nfc://[<Datastore_Name>] <VM_Name>/<VM_Name>.vmdk@<esx_Name>:902' with flags 0x1e NBD_ERR_NETWORK_CONNECT (2338).

 

Resolution

解决办法：
  1. 将无法备份到另一台 ESX 服务器的虚拟机（上面称为“VM_Name”）托管 VMotion 。
  2. 对迁移的虚拟机执行按需备份。
  3. 成功完成后，客户应联系其网络团队，以检查为什么在代理（上文称为“Proxy_Name”）和 ESX（称为“esx_name”）之间丢弃数据包。

备选解决方法：

在 DNS 中检查 ESX 服务器的记录，以查看用于此组备份的代理是否可以解析具有相同记录的此 ESX 主机。  

为此，请执行以下操作：
  1. 打开用于备份的代理（即 Proxy_Name）的 putty。
  2. 运行 nslookup <esx_FQN>命令。
  3. 如果结果为否定，则要求客户修改 DNS 上的 esx 记录，或者使用正确的 esx FQN 和 IP 添加每个代理 /etc/hosts 文件。

 

Additional Information

Avamar 版本：7.1.1.145

Affected Products

Avamar

Products

Avamar, Avamar Client for VMware
Article Properties
Article Number: 000064048
Article Type: Solution
Last Modified: 07 Nov 2025
Version:  3
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