这个错误让我发疯，我甚至无法复现它！
我已经将我的网站发布到Windows Azure和SQL Azure，并且一切都运行得很好。突然之间它就不能工作了，我收到了这个令人讨厌的错误：
这是我收到的错误：
http://jsfiddle.net/shimmy/pcS7g/embedded/result
这是错误信息：
在建立到SQL Server的连接时发生与网络相关或特定于实例的错误。找不到服务器或无法访问。请验证实例名称是否正确，并确认SQL Server已配置为允许远程连接。（提供程序：SQL Network Interfaces，错误：26 - 找不到服务器/指定的实例）
我想强调的是，我可以通过SSMS或VS访问SQL并查看我的表等。
我不知道是什么原因导致这个恼人的错误，在每次部署后都会再次出现。
堆栈跟踪：
[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)]
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +5295167
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +242
System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover) +5307115
System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover) +145
System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout) +920
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance) +307
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions) +434
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) +5309659
System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup, DbConnectionOptions userOptions) +38
System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +5311874
System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +143
System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +83
System.Data.SqlClient.SqlConnection.Open() +96
System.Web.Management.SqlServices.GetSqlConnection(String server, String user, String password, Boolean trusted, String connectionString) +76
[HttpException (0x80004005): Unable to connect to SQL Server database.]
System.Web.Management.SqlServices.GetSqlConnection(String server, String user, String password, Boolean trusted, String connectionString) +131
System.Web.Management.SqlServices.SetupApplicationServices(String server, String user, String password, Boolean trusted, String connectionString, String database, String dbFileName, SqlFeatures features, Boolean install) +89
System.Web.Management.SqlServices.Install(String database, String dbFileName, String connectionString) +27
System.Web.DataAccess.SqlConnectionHelper.CreateMdfFile(String fullFileName, String dataDir, String connectionString) +386
更新
以下是服务器 web.config 文件中连接字符串的副本：
<connectionStrings>
<add name="Context" connectionString="Data Source=tcp:abcdefg.database.windows.net,1433;Initial Catalog=Database;User Id=shimmy@tcp:abcdefg;Password=my123password;" providerName="System.Data.SqlClient" />
<add name="Storage" connectionString="DefaultEndpointsProtocol=https;AccountName=accountname;AccountKey=accountkey==" />
</connectionStrings>
我甚至尝试从服务器的web.config文件中彻底删除连接字符串。我不知道这个App_Data是从哪里来的！
我的DbContext看起来像这样:
public Context()
: base("name=Context") //I also tried "Context" alone
{
}