Exception: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.

Hi, I have aspboilerplate application with many users that have activities on this application. If in the same time are many users authenticated I get exception. The Boilerplate application is last version (.net5) I found this on stackoverflow.com (In most cases connection pooling problems are related to connection leaks) If i restart my IIS application works.

ERROR 2020-12-17 08:58:37,955 [417  ] Mvc.ExceptionHandling.AbpExceptionFilter - Timeout expired.  The timeout period elapsed prior to obtaining a connection from the pool.  This may have occurred because all pooled connections were in use and max pool size was reached.
System.InvalidOperationException: Timeout expired.  The timeout period elapsed prior to obtaining a connection from the pool.  This may have occurred because all pooled connections were in use and max pool size was reached.
   at Microsoft.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   at Microsoft.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at Microsoft.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   at Microsoft.Data.SqlClient.SqlConnection.Open()
   at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.OpenDbConnection(Boolean errorsExpected)
   at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open(Boolean errorsExpected)
   at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.BeginTransaction(IsolationLevel isolationLevel)
   at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
   at Microsoft.EntityFrameworkCore.RelationalDatabaseFacadeExtensions.BeginTransaction(DatabaseFacade databaseFacade, IsolationLevel isolationLevel)
   at Abp.EntityFrameworkCore.Uow.DbContextEfCoreTransactionStrategy.CreateDbContext[TDbContext](String connectionString, IDbContextResolver dbContextResolver)
   at Abp.EntityFrameworkCore.Uow.EfCoreUnitOfWork.GetOrCreateDbContext[TDbContext](Nullable`1 multiTenancySide, String name)
   at Abp.EntityFrameworkCore.Repositories.EfCoreRepositoryBase`3.get_Table()
   at Abp.EntityFrameworkCore.Repositories.EfCoreRepositoryBase`3.Insert(TEntity entity)
   at Abp.EntityFrameworkCore.Repositories.EfCoreRepositoryBase`3.InsertAsync(TEntity entity)
   at Castle.Proxies.Invocations.IRepository`2_InsertAsync_28.InvokeMethodOnTarget()
   at Castle.DynamicProxy.AbstractInvocation.Proceed()
   at Castle.DynamicProxy.AbstractInvocation.ProceedInfo.Invoke()
   at Abp.Domain.Uow.UnitOfWorkInterceptor.InternalInterceptAsynchronous[TResult](IInvocation invocation)
   at Abp.Auditing.AuditingHelper.SaveAsync(AuditInfo auditInfo)
   at Abp.AspNetCore.Mvc.Auditing.AbpAuditActionFilter.OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
ERROR 2020-12-17 08:58:37,955 [129  ] Mvc.ExceptionHandling.AbpExceptionFilter - Timeout expired.  The timeout period elapsed prior to obtaining a connection from the pool.  This may have occurred because all pooled connections were in use and max pool size was reached.

[totpero]

For the moment I don’t get this error, if the error is repeated i will report here. Thanks.

[ismcagdas]

@totpero please reopen if you face this problem again.