SQL Connection Error System Data SqlClient SqlException 0x80131904

Question

I am seeing this in several situations and it is intermittent in our web based application  connecting to SQL 2008 R2 serve back end  Users are coming across a point 2 point connection and seeing this on and off  Thought it was bandwidth issues until I started seeing it on terminal servers that are on the same core switch as this SQL server  I have checked remote connection enabled  Port 1433 is set correctly in Configuration for TCP IP and the only thing I see that could be a cause is the timeout setting is set to 100000 in the remote connections rather than unlimited    The error is      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  --- gt       System ComponentModel Win32Exception  0x80004005   The network path   was not found 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  SessionData reconnectSessionData  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  DbConnection owningObject  DbConnectionOptions options  DbConnectionPoolKey poolKey  DbConnectionOptions userOptions  at System Data ProviderBase DbConnectionPool CreateObject DbConnection owningObject  DbConnectionOptions userOptions  DbConnectionInternal oldConnection  at System Data ProviderBase DbConnectionPool UserCreateRequest DbConnection owningObject  DbConnectionOptions userOptions  DbConnectionInternal oldConnection  at System Data ProviderBase DbConnectionPool TryGetConnection DbConnection owningObject  UInt32 waitForMultipleObjectsTimeout  Boolean allowCreate  Boolean onlyOneCheckConnection  DbConnectionOptions userOptions  DbConnectionInternal amp  connection  at System Data ProviderBase DbConnectionPool TryGetConnection DbConnection owningObject  TaskCompletionSource 1 retry  DbConnectionOptions userOptions  DbConnectionInternal amp  connection  at System Data ProviderBase DbConnectionFactory TryGetConnection DbConnection owningConnection  TaskCompletionSource 1 retry  DbConnectionOptions userOptions  DbConnectionInternal oldConnection  DbConnectionInternal amp  connection  at System Data ProviderBase DbConnectionInternal TryOpenConnectionInternal DbConnection outerConnection  DbConnectionFactory connectionFactory  TaskCompletionSource 1 retry  DbConnectionOptions userOptions  at System Data ProviderBase DbConnectionClosed TryOpenConnection DbConnection outerConnection  DbConnectionFactory connectionFactory  TaskCompletionSource 1 retry  DbConnectionOptions userOptions  at System Data SqlClient SqlConnection TryOpenInner TaskCompletionSource 1 retry  at System Data SqlClient SqlConnection TryOpen TaskCompletionSource 1 retry  at System Data SqlClient SqlConnection Open   at System Data Entity SqlServer DefaultSqlExecutionStrategy  lt  gt c  DisplayClass1 b  0   at System Data Entity SqlServer DefaultSqlExecutionStrategy Execute TResult  Func 1 operation  at System Data Entity SqlServer DefaultSqlExecutionStrategy Execute Action operation  at System Data Entity Core EntityClient EntityConnection Open   ClientConnectionId 00000000-0000-0000-0000-000000000000

User · Answer

I had the same issue   Make sure that In SQL Server configuration --  SQL Server Services --  SQL Server Agent is enable  This solved my problem

User · Answer

Anyone who has this error  especially on Azure  try adding  tcp   to the db-server-name in your connection string in your application  This forces the sql client to communicate with the db using tcp  I m assuming the connection is UDP by default and there can be intermittent connection issues

User · Answer

Check you routes  the update on 9 28 2014 impacted us  We had to adjust our older servers and add new routes  Here is the article http   www rackspace com knowledge center article updating-servicenet-routes-on-cloud-servers-created-before-june-3-2013

User · Answer

Check these steps    go to Sql Server Configuration management- SQL Server network config- protocols for  servername  and check TCP IP is enabled  Open SSMS in run  and check you are able to login to server using specfied username password and or using windows authentication  repeat step 1 for SQL native client config also

User · Answer

i had the same issue  go to Sql Server Configuration management- SQL Server network config- protocols for  servername  and check named pipes is enabled

User · Answer

See my post here     How are you  I had the same problem while i was trying connect to   MSSQL Server  remotely  using jdbc  dbeaver on debian        After a while  i found out that my firewall configuration was not   correctly  So maybe it could help you            Configure the firewall to allow network traffic that is related to SQL     Server and to the SQL Server Browser service           Four exceptions must be configured in Windows Firewall to allow access     to SQL Server           A port exception for TCP Port 1433  In the New Inbound Rule Wizard     dialog  use the following information to create a port exception      Select Port Select TCP and specify port 1433 Allow the connection     Choose all three profiles  Domain  Private  amp  Public  Name the rule        SQL     TCP 1433  A port exception for UDP Port 1434  Click New Rule     again and use the following information to create another port     exception  Select Port Select UDP and specify port 1434 Allow the     connection Choose all three profiles  Domain  Private  amp  Public  Name     the rule    SQL     UDP 1434 A program exception for sqlservr exe  Click     New Rule again and use the following information to create a program     exception  Select Program Click Browse to select    sqlservr exe    at     this location   C  Program Files Microsoft SQL     Server MSSQL11  MSSQL Binn sqlservr exe  where      is the name of your SQL instance   Allow the     connection Choose all three profiles  Domain  Private  amp  Public  Name     the rule SQL     sqlservr exe A program exception for sqlbrowser exe     Click New Rule again and use the following information to create     another program exception  Select Program Click Browse to select     sqlbrowser exe at this location   C  Program Files Microsoft SQL     Server 90 Shared sqlbrowser exe    Allow the connection Choose all     three profiles  Domain  Private  amp  Public  Name the rule SQL -     sqlbrowser exe         Source    http   blog citrix24 com configure-sql-express-to-accept-remote-connections

[.net] SQL Connection Error: System.Data.SqlClient.SqlException (0x80131904)

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