由于公司电路切换，昨天晚上不得不将服务器暂时关闭。早上重新开机时，发现开发环境连不上了。这可把我急坏了，大家可都等着开发呢。
于是查看服务器错误消息，发现时数据库连接连接不上。
The initialization of the CRM authentication pipline execution has failed for org crmserver-01 with a sql error: 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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) ---> System.ComponentModel.Win32Exception (0x80004005): Access is denied
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover)
at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover)
at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout)
at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance)
at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions)
at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
at System.Data.SqlClient.SqlConnection.Open()
at Microsoft.Crm.CrmDbConnection.GetCreateAndOpenConnection()
at Microsoft.Crm.CrmDbConnection.Open()
at Microsoft.Crm.SqlExecutionContext.OnBeginRequest(Boolean startTransaction, IsolationLevel isoLevel, SolutionOperationContext operationContext, Guid solutionId, String workloadGroup)
at Microsoft.Crm.BusinessEntities.ExecutionContext.OnBeginRequest(Guid userId, Boolean startTransaction, IsolationLevel isolationLevel, ExecutionOperationContext operationContext, CallerOriginToken originToken)
at Microsoft.Crm.BusinessEntities.ExecutionContext.OnBeginRequest(Guid userId, Boolean startTransaction, IsolationLevel isolationLevel, ExecutionOperationContext operationContext)
at Microsoft.Crm.BusinessEntities.ExecutionContext.OnBeginRequest(Boolean startTransaction)
at Microsoft.Crm.Caching.ObjectModelCacheLoader`2.LoadCacheData(TKey key, IOrganizationContext context)
at Microsoft.Crm.Caching.CrmMultiOrgCacheBase`2.CreateEntry(TKey key, IOrganizationContext context)
at Microsoft.Crm.Caching.CrmMultiOrgCacheBase`2.LookupEntry(TKey key, IOrganizationContext context)
at Microsoft.Crm.BusinessEntities.SecurityLibrary.GetUserInfoCommon(IOrganizationContext context, Guid userGuid, LocatorServiceContext locatorServiceContext)
at Microsoft.Crm.BusinessEntities.SecurityLibrary.GetCallerAndBusinessGuidsFromThread(WindowsIdentity identity, Guid organizationId, LocatorServiceContext locatorServiceContext)
at Microsoft.Crm.Authentication.CrmWindowsIdentity..ctor(WindowsIdentity innerIdentity, Boolean publishCrmUser, Guid organizationId)
at Microsoft.Crm.Authentication.WindowsAuthenticationProviderBase.Authenticate(HttpApplication application, WindowsIdentity userIdentity)
at Microsoft.Crm.Authentication.AuthenticationStep.Authenticate(HttpApplication application)
at Microsoft.Crm.Authentication.AuthenticationPipeline.Authenticate(HttpApplication application)
at Microsoft.Crm.Authentication.AuthenticationEngine.Execute(Object sender, EventArgs e)
ClientConnectionId:00000000-0000-0000-0000-000000000000.
登录数据库服务器，发现数据库服务完好，并无问题。那应该就是连接的问题。可昨天关机前明明好好的。
到CRM服务器用SSMS连接数据库服务，发现连接不上。由此可断定是防火墙的导致数据库连接被阻止。
打开数据库服务器防火墙，发现Public networks处于连接状态。
但之前的状态是只有域网络是连接的，家庭网络和公共网络均是未连接的。可能是服务器安装360而开启了公共网络防火墙。
马上关闭公共网络的防火墙，问题马上解决。