Avamar：備份失敗，並顯示「由於系統缺乏足夠的緩充空間，無法對套接字執行作業...」

Windows 檔案系統備份可能會失敗，並出現類似以下的錯誤：

2018-11-29 13:17:41 avtar Info <5694>: - Failed initial handshake, trying again
2018-11-29 13:17:41 avtar Info <6063>: - Communication error: Could not create connection to Server
2018-11-29 13:17:41 avtar Info <5557>: No connections available
2018-11-29 13:17:41 avtar FATAL <8941>: Fatal server connection problem, aborting initialization. Verify correct server address and login credentials.

在資料集或 \Program Files\avs\var 目錄 （--debug 旗標） 的 avtar.cmd 檔案中啟用除錯時，可能會看到下列訊息：

2018/11/29-18:17:41.74900 [avtar]  Windows ::connect() code 10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full
2018/11/29-18:17:41.74900 [avtar]  sockimpl::init connect returns -1 errno=2 No such file or directory
2018/11/29-18:17:41.74900 [avtar]  sslsockimpl::open  failure
2018/11/29-18:17:41.74900 [avtar]  tcpsockimpl::close shutdown error -1 errno 2 code 10057: A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied

 

這是由 Windows 作業系統中的連接埠耗盡所造成。當應用程式在短時間內建立過多傳出連接或未正確處置傳出連接時，它會耗盡 avtar 進程所需的可用埠。

若要確認，請開啟 PowerShell 或 Windows 命令提示字元，並執行下列命令：

netstat -ab

https://stackoverflow.com/questions/4415175/an-operation-on-a-socket-could-not-be-performed-because-the-system-lacked-suffi

http://blog.whitesites.com/blog.aspx?key=635140180116307813

https://support.microsoft.com/en-us/help/929851/the-default-dynamic-port-range-for-tcp-ip-has-changed-in-windows-vistahttps://www.aip.im/2012/10/how-to-change-the-number-of-dynamic-ports/