few test to resolve maximum connection poo betwwenl ASP.NET and SQL Server.txt

//http://stackoverflow.com/questions/670774/how-can-i-solve-a-connection-pool-problem-between-asp-net-and-sql-server#670842
You can specify minimum and maximum pool size by specifying MinPoolSize=xyz and/or MaxPoolSize=xyz in the connection string. This cause of the problem could be a different thing however.
XpoProvider=MSSqlServer;Data Source=.\SQLEXPRESS;User ID=sa;Password=●●●●●●●●;Initial Catalog=360plus;MaxPoolSize=1000

//increase user connections SQL Server
//https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/configure-the-user-connections-server-configuration-option
USE AdventureWorks2012 ;  
GO  
EXEC sp_configure 'show advanced options', 1;  
GO  
RECONFIGURE ;  
GO  
EXEC sp_configure 'user connections', 325 ;  
GO  
RECONFIGURE;  
GO