1. Make sure you are closing the connection after each request made to server. You can check the open connections using below T-SQL.
SELECT
DB_NAME(dbid) as DBName, status,
COUNT(dbid) as NumberOfConnections,
loginame as LoginName
FROM
sys.sysprocesses
WHERE
dbid > 0
GROUP BY
dbid, loginame, status
2. Increase the time out of connection object, default is 30 seconds.