[Win32Exception (0x80004005): The wait operation timed out]

[SqlException (0x80131904): Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +388
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +717
   System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +4515
   System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +6562873
   System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds) +6565639
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) +586
   System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite) +742
   System.Data.SqlClient.SqlCommand.ExecuteNonQuery() +287
   System.Web.SessionState.SqlSessionStateStore.SqlExecuteNonQueryWithRetry(SqlCommand cmd, Boolean ignoreInsertPKException, String id) +203

[HttpException (0x80004005): Unable to connect to SQL Server session database.]
   System.Web.SessionState.SqlSessionStateStore.SqlExecuteNonQueryWithRetry(SqlCommand cmd, Boolean ignoreInsertPKException, String id) +3532400
   System.Web.SessionState.SqlSessionStateStore.ReleaseItemExclusive(HttpContext context, String id, Object lockId) +425
   System.Web.SessionState.SessionStateModule.GetSessionStateItem() +458
   System.Web.SessionState.SessionStateModule.PollLockedSessionCallback(Object state) +299

[HttpException (0x80004005): Exception of type 'System.Web.HttpException' was thrown.]
   System.Web.SessionState.SessionStateModule.EndAcquireState(IAsyncResult ar) +12416784
   System.Web.AsyncEventExecutionStep.OnAsyncEventCompletion(IAsyncResult ar) +166