WSUS同步失败在同步中

与上游服务器的WSUS同步启动正常，并在同步中突然失败：

Sync failed: IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException:An existing connection was forcibly closed by the remote host at System.Net.ConnectStream.Read(Byte[] buffer, int32 offset,int32 size) at Microsoft.UpdateServices.ServerSync.ServerSyncCompressionProxy.GetWebResponse(WebRequest webRequest) at System.WebServices.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) at Microsoft.UpdateServices.ServerSync.Webservices.ServerSync.ServerSyncProxy.GetUpdateData(Cookie cookie, UpdateIdentity[] updateIds) at Microsoft.UpdateServices.ServerSync.CatlogSyncAgentCore.WebserviceGetUpdateData(UpdateIdentity[] updateIds, List`1 allMetadata,List`1 allFleUrls,Boolean isForConfig) at Microsoft.UpdateServices.ServerSync.CatlogSyncAgentCore.GetUpdateDatainChunksAndlmport(List`1 allMetadata,List`1 allFleUrls,Boolean isForConfigData) at Microsoft.UpdateServices.ServerSync.CatlogSyncAgentCore.ExecuteSyncProtocol(boolean allowRedirect)) 

 netsh接口tcp显示全局
查询活动状态...

 TCP全局参数
 ----------------------------------------------
接收方缩放状态：启用
烟囱卸载状态：禁用
 NetDMA状态：禁用
直接高速caching访​​问（DCA）：禁用
 **接收窗口自动调谐级别：正常**
附加拥塞控制提供程序：无
 ECNfunction：启用
 RFC 1323时间戳：已禁用
初始RTO：3000
接收分段合并状态：启用
 Non Sack Rtt弹性：禁用
最大SYN重传：2

 netsh接口tcp设置全局autotuninglevel =禁用
好。

 netsh接口tcp设置全局autotuninglevel =正常
好。