到遠程服務器的SQL連接錯誤

Question

您好我有一個應用程序在C＃中將數據從遠程託管服務器（winhost）下拉以同步到本地sql服務器（複製不是選項）......非常小的數據集10 -100測試我只檢索2行。該應用程序在我的開發機器上正常工作。然而，客戶端網絡上，我得到一個間歇性的錯誤說有一半的時間：

Error Occurred Getting Record From Remote Server: Details => System.Data.SqlClient.SqlException (0x80131904): 
A network-related or instance-specific error occurred while establishing a connection to SQL Server. 
The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server 
is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating 
Server/Instance Specified) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, 
Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()  At 
System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, 
Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity) 
at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, SqlConnection owningObject) at 
System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, 
Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, 
TimeoutTimer timeout) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection 
owningObject, TimeoutTimer timeout, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUser 
Instance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString 
connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) 
at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object 
poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) at System.Data.ProviderBase. 
DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) 
at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) 
at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) 
at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) 
at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) 
at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, 
DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at 
System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode) at AfocImport.Program.Main(String[] args) 

在我的機器我有20 MB/s下降和應用程序的工作原理沒有問題，從來沒遇到過這種錯誤，但是客戶端是T1 1.5MB/s下。我假設這是問題，但它也可能是客戶端網絡上的東西（防火牆我檢查）...

所以我的問題是這個錯誤只是表示連接超時，或者可能是別的東西？如果是這樣，我能做些什麼來糾正這種情況（不幸的是，這是客戶唯一可用的互聯網）。我試圖搞亂連接超時，但這似乎沒有什麼區別。

Answer 1

ping/tracert是什麼樣的？如何嘗試使用端口1433上的telnet連接到遠程服務器？我的猜測是端口被阻塞或者DNS無法解析。你是否試圖通過名稱連接到遠程服務器？你有沒有嘗試IP地址？