I'm using this connection string

strConnect = "Provider=sqloledb;Data Source=(local);Initial Catalog=bookworks;Integrated Security=SSPI;"

It can connect to mssql, but sometimes it gives the following error.

Microsoft OLE DB Provider for SQL Server error '80004005'
[DBNETLIB][ConnectionOpen (SECDoClientHandshake()).]SSL Security error.

I got this error around three times since the website launch. around 3000 users visiting the website in the peak.

I restart IIS when I get this error, then it back to normal, does anyone know what's going on? thanks