System Data SqlClient SqlException Login failed for user

Question

Working with my project in debug I have no issues  However running it in IIS I am getting this error   System Data SqlClient SqlException  Login failed for user  domain name-PC     Stack Trace   SqlException  0x80131904   Login failed for user  DOMAIN NAME-PC        System Data SqlClient SqlInternalConnection OnError SqlException exception  Boolean breakConnection  Action 1 wrapCloseInAction   6749670    System Data SqlClient TdsParser ThrowExceptionAndWarning TdsParserStateObject stateObj  Boolean callerHasConnectionLock  Boolean asyncClose   815    System Data SqlClient TdsParser TryRun RunBehavior runBehavior  SqlCommand cmdHandler  SqlDataReader dataStream  BulkCopySimpleResultSet bulkCopyHandler  TdsParserStateObject stateObj  Boolean amp  dataReady   4515    System Data SqlClient TdsParser Run RunBehavior runBehavior  SqlCommand cmdHandler  SqlDataReader dataStream  BulkCopySimpleResultSet bulkCopyHandler  TdsParserStateObject stateObj   84    System Data SqlClient SqlInternalConnectionTds CompleteLogin Boolean enlistOK   53    System Data SqlClient SqlInternalConnectionTds AttemptOneLogin ServerInfo serverInfo  String newPassword  SecureString newSecurePassword  Boolean ignoreSniOpenTimeout  TimeoutTimer timeout  Boolean withFailover   368    System Data SqlClient SqlInternalConnectionTds LoginNoFailover ServerInfo serverInfo  String newPassword  SecureString newSecurePassword  Boolean redirectedUserInstance  SqlConnectionString connectionOptions  SqlCredential credential  TimeoutTimer timeout   6777754    System Data SqlClient SqlInternalConnectionTds OpenLoginEnlist TimeoutTimer timeout  SqlConnectionString connectionOptions  SqlCredential credential  String newPassword  SecureString newSecurePassword  Boolean redirectedUserInstance   6778255    System Data SqlClient SqlInternalConnectionTds  ctor DbConnectionPoolIdentity identity  SqlConnectionString connectionOptions  SqlCredential credential  Object providerInfo  String newPassword  SecureString newSecurePassword  Boolean redirectedUserInstance  SqlConnectionString userConnectionOptions  SessionData reconnectSessionData   878    System Data SqlClient SqlConnectionFactory CreateConnection DbConnectionOptions options  DbConnectionPoolKey poolKey  Object poolGroupProviderInfo  DbConnectionPool pool  DbConnection owningConnection  DbConnectionOptions userOptions   1162    System Data ProviderBase DbConnectionFactory CreatePooledConnection DbConnectionPool pool  DbConnection owningObject  DbConnectionOptions options  DbConnectionPoolKey poolKey  DbConnectionOptions userOptions   72    System Data ProviderBase DbConnectionPool CreateObject DbConnection owningObject  DbConnectionOptions userOptions  DbConnectionInternal oldConnection   6781425    System Data ProviderBase DbConnectionPool UserCreateRequest DbConnection owningObject  DbConnectionOptions userOptions  DbConnectionInternal oldConnection   103    System Data ProviderBase DbConnectionPool TryGetConnection DbConnection owningObject  UInt32 waitForMultipleObjectsTimeout  Boolean allowCreate  Boolean onlyOneCheckConnection  DbConnectionOptions userOptions  DbConnectionInternal amp  connection   2105    System Data ProviderBase DbConnectionPool TryGetConnection DbConnection owningObject  TaskCompletionSource 1 retry  DbConnectionOptions userOptions  DbConnectionInternal amp  connection   116    System Data ProviderBase DbConnectionFactory TryGetConnection DbConnection owningConnection  TaskCompletionSource 1 retry  DbConnectionOptions userOptions  DbConnectionInternal oldConnection  DbConnectionInternal amp  connection   1089    System Data ProviderBase DbConnectionInternal TryOpenConnectionInternal DbConnection outerConnection  DbConnectionFactory connectionFactory  TaskCompletionSource 1 retry  DbConnectionOptions userOptions   6785863    System Data SqlClient SqlConnection TryOpenInner TaskCompletionSource 1 retry   233    System Data SqlClient SqlConnection TryOpen TaskCompletionSource 1 retry   278    System Data SqlClient SqlConnection Open    239    System Data Linq SqlClient SqlConnectionManager UseConnection IConnectionUser user   65    System Data Linq SqlClient SqlProvider get IsSqlCe    38    System Data Linq SqlClient SqlProvider InitializeProviderMode    30    System Data Linq SqlClient SqlProvider System Data Linq Provider IProvider Execute Expression query   81    System Data Linq DataQuery 1 System Collections Generic IEnumerable lt T gt  GetEnumerator    54    System Collections Generic List 1  ctor IEnumerable 1 collection   446    System Linq Enumerable ToList IEnumerable 1 source   80    MvcMobile Controllers HomeController Index    38    lambda method Closure   ControllerBase   Object      79    System Web Mvc ReflectedActionDescriptor Execute ControllerContext controllerContext  IDictionary 2 parameters   261    System Web Mvc ControllerActionInvoker InvokeActionMethod ControllerContext controllerContext  ActionDescriptor actionDescriptor  IDictionary 2 parameters   39    System Web Mvc Async  lt  gt c  DisplayClass42  lt BeginInvokeSynchronousActionMethod gt b  41    34    System Web Mvc Async  lt  gt c  DisplayClass39  lt BeginInvokeActionMethodWithFilters gt b  33    124    System Web Mvc Async  lt  gt c  DisplayClass4f  lt InvokeActionMethodFilterAsynchronously gt b  49    839035    System Web Mvc Async  lt  gt c  DisplayClass37  lt BeginInvokeActionMethodWithFilters gt b  36 IAsyncResult asyncResult   15    System Web Mvc Async  lt  gt c  DisplayClass2a  lt BeginInvokeAction gt b  20    33    System Web Mvc Async  lt  gt c  DisplayClass25  lt BeginInvokeAction gt b  22 IAsyncResult asyncResult   839620    System Web Mvc  lt  gt c  DisplayClass1d  lt BeginExecuteCore gt b  18 IAsyncResult asyncResult   28    System Web Mvc Async  lt  gt c  DisplayClass4  lt MakeVoidDelegate gt b  3 IAsyncResult ar   15    System Web Mvc Controller EndExecuteCore IAsyncResult asyncResult   65    System Web Mvc Async  lt  gt c  DisplayClass4  lt MakeVoidDelegate gt b  3 IAsyncResult ar   15    System Web Mvc Controller EndExecute IAsyncResult asyncResult   51    System Web Mvc  lt  gt c  DisplayClass8  lt BeginProcessRequest gt b  3 IAsyncResult asyncResult   42    System Web Mvc Async  lt  gt c  DisplayClass4  lt MakeVoidDelegate gt b  3 IAsyncResult ar   15    System Web Mvc MvcHandler EndProcessRequest IAsyncResult asyncResult   51    System Web CallHandlerExecutionStep System Web HttpApplication IExecutionStep Execute    606    System Web HttpApplication ExecuteStep IExecutionStep step  Boolean amp  completedSynchronously   288   The number one solution I can find through Google is to change the application pool advanced Identity settings which did not work   I am using IIS 7 5 and I am connecting to SQLServer 2012 my connection string is below   Connection String   lt add name   DataConnectionString  connectionString  Data Source 01DEV SQLDEV01 Initial Catalog  Data Integrated Security True MultipleActiveResultSets True Application Name EntityFramework    providerName  System Data SqlClient    gt

User · Answer

kinda dumb  but I had a weird character      in my password  After omitting it  I no longer got the error

User · Answer

Just set Integrated Security False and it will work  according to a comment difference between True and False is      True ignores User ID and Password if provided and uses those of the running process  SSPI Security Support Provider Interface   it will use them if provided which is why MS prefers this    They are equivalent in that they use the same security mechanism to authenticate but that is it

User · Answer

I faced the same situation  Create your connection string as follows   Replace   connectionString    Data Source server name Initial Catalog DB name User id user id Password password Integrated Security True MultipleActiveResultSets True    by   connectionString    Server server name  Database Treat  User Id user id  Password password  Trusted Connection False  MultipleActiveResultSets true

User · Answer

add persist security info True  in connection string

User · Answer

Assuming you re intending to use Windows Authentication to impersonate the service account  you have to set up Windows Authentication in both IIS and ASP NET    In IIS  make sure that the Windows Authentication module is added and enabled  Also make sure your application pool is running under a domain account  not a local account   In ASP NET make sure the authentication mode attribute is set to  Windows    lt system web gt       lt authentication mode  Windows   gt    lt  system web gt

User · Answer

Numpty here used SQL authentication    instead of Windows  correct     when adding the login to SQL Server  which also gives you this error if you are using Windows auth

User · Answer

I tried some of the suggested answers but it didn t resolve the issue  Finally I found out that the default connection timeout  not command timeout  is 15 seconds and once I increased it to 60 it almost never happened again  simply add this to you connection string   Connection Timeout 60 I chose 60 seconds but you can put any value you think would fit the best to your needs

User · Answer

You can also get this error if your SQL Server has not been configured to use Mixed mode authentication - it doesn t actually tell you that this is not enabled

User · Answer

Check the properties of SQL Sever from the Object explorer  If Integrated Security is set to true  make the same changes in connection string as well  check the screenshot of the property grid  It worked in case of ASP NET Core Web Api

User · Answer

I just ran into this error and it took days to resolve  We were thrown for a loop by the red-herring error message mentioned in the initial question  plus the Windows Event Viewer error log indicated something similar   Login failed for user   domain name-PC     Reason  Could not find a login matching the name provided   CLIENT   lt local machine gt     Neither of these was true  the user had all the necessary permissions in SQL Server    In our case  the solution was to switch the Application Pool Identity in IIS to NetworkService

User · Answer

I had similar experience and it took me time to solve the problem  Though  my own case was ASP Net MVC Core and Core framework  Setting Trusted Connection False  solved my problem   Inside appsettings json file   ConnectionStrings          DefaultConnection    Server servername  Database databasename  User Id userid  Password password  Trusted Connection False  MultipleActiveResultSets true

[c#] System.Data.SqlClient.SqlException: Login failed for user

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