Porque al autorizar las solicitudes de vacacion se genera este error?

Las solicitudes de vacaciones que graban los usuarios generan el siguiente error en el "visor de procesos" al autorizarse. cabe mencionar que no posee una configuracion especial al momento de autorizar y problema persiste aun cuando reintento la ejecucion.

System.Transactions.TransactionException: The operation is not valid for the state of the transaction. ---> System.TimeoutException: Transaction Timeout --- End of inner exception stack trace --- at System.Transactions.TransactionState.EnlistPromotableSinglePhase(InternalTransaction tx, IPromotableSinglePhaseNotification promotableSinglePhaseNotification, Transaction atomicTransaction) at System.Transactions.Transaction.EnlistPromotableSinglePhase(IPromotableSinglePhaseNotification promotableSinglePhaseNotification) at System.Data.SqlClient.SqlInternalConnection.EnlistNonNull(Transaction tx) at System.Data.ProviderBase.DbConnectionPool.PrepareConnection(DbConnection owningObject, DbConnectionInternal obj, Transaction transaction) 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, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1 retry, DbConnectionOptions userOptions) at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource1 retry) at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource1 retry) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetNewOpenConnection() at Microsoft.Practices.EnterpriseLibrary.Data.TransactionScopeConnections.GetConnection(Database db) at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteScalar(DbCommand command) at Aseinfo.Infrastructure.Repositories.DbDataAccessRepository.ExecuteScalarFunction(String functionName, IDictionary2 valoresParametros) in c:VH4InfrastructureDataDbDataAccessRepository.cs:line 424 at Aseinfo.Infrastructure.Services.DbDataAccessService.ExecuteScalarFunctionT in c:BuildAgentwork608d469cc106b504VH4GeneralServicesParametrosParametroAplicacionService.cs:line 156 at Aseinfo.VH4.Infraestructura.Services.Calculos.CalculosTiempoService.GetFechaFinalPeriodoGoceVacacion(Empleo empleo, DateTime fechaInicio, Decimal diasGoce) in c:VH4VH4InfraestructuraServicesCalculosCalculosTiempoService.cs:line 682 at Aseinfo.VH4.Acciones.Services.SolicitudVacacionService.FinalizaProcesamientoEntidad(EntityObject entity) in c:VH4VH4AccionesServicesSolicitudesVacacionesSolicitudVacacionService.cs:line 215 at Aseinfo.VH4.WindowsServices.ApplicationJobs.AccionFinalizacionJob.Execute(JobExecutionContext context) in c:VH4VH4WindowsServicesApplicationJobsWindowsServiceApplicationJobsAccionFinalizacionJob.cs:line 248