Avamar VM 映像備份失敗，並顯示錯誤訊息：「NBD_ERR_NETWORK_CONNECT」

Summary: VM 備份失敗，並顯示錯誤訊息：「無法開啟『vpxa-nfcssl：//[] /.vmdk@：902' 帶旗幟0x1e NBD_ERR_NETWORK_CONNECT （2338）”

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
Check out other resources

Symptoms



  • VM 備份失敗，並出現下列錯誤： 
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

  • 代理已透過連接埠 902 連接到 esx，但嘗試連接到 VM 磁碟不止一次，但由於網路問題（即丟包）而失敗，並顯示以下錯誤：    
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

因應措施：
  1. 主機 VMotion 無法備份至其他 ESX 伺服器 （上稱為「VM_Name」） 的虛擬機器。
  2. 對遷移的虛擬機執行按需備份。
  3. 成功完成後，客戶應聯絡其網路團隊，檢查在代理 （上述稱為「Proxy_Name」） 和 ESX （稱為「esx_name」） 之間丟棄封包的原因。

替代因應措施：

檢查 DNS 中的 ESX 伺服器記錄，查看用於此群組備份的代理是否可以解析具有相同記錄的此 ESX 主機。  

若要執行此動作：
  1. 開啟備份專用代理的 putty （即 Proxy_Name）。
  2. 執行 nslookup <esx_FQN>命令。
  3. 如果結果為否定，請客戶修改 DNS 上的 esx 記錄，或新增每個代理 /etc/hosts 檔案與正確的 esx FQN 和 IP。

 

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
Find answers to your questions from other Dell users
Support Services
Check if your device is covered by Support Services.