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

• VM 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

代理已通过端口 902 连接到 ESX，并且多次尝试连接到虚拟机磁盘，但由于网络问题（例如丢包）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).

解决方法：

1. 主机 VMotion 无法备份到另一台 ESX 服务器的虚拟机（在上面称为“VM_Name”）。
2. 对迁移的虚拟机运行按需备份。
3. 成功完成后，客户应 联系其网络团队 ，检查代理（以上称为“Proxy_Name”）和 ESX（称为“esx_name”）之间丢弃数据包的原因。

备选解决办法

检查 DNS 中 ESX 服务器的记录，以查看用于此组备份的代理是否可以使用相同的记录解析此 ESX 主机。

为此，请执行以下操作：

1. 打开 用于备份的代理的 PuTTY（例如，Proxy_Name）。
2. 运行 nslookup <esx_FQN> 命令。
3. 如果结果为否定，请要求客户修改 DNS 上的 ESX 记录 或添加每个代理 /etc/hosts 文件，其中包含正确的 ESX FQN 和 IP。