Who created the concrete implementation for the MySql database?

http://www.google.com/search?source=ig&hl=en&rlz=&q=EnterpriseLibrary+MySql

You'll need to find those people and use their support.

The framework includes (if I recall correctly) Sql Server , Oracle and DB2.
(Aka, the included concrete versions)

But someone else has written the concrete version for MySql.

This is the error message and trace info:

This happens even I kill all connections:

Exception Details: MySql.Data.MySqlClient.MySqlException: error
connecting: Timeout expired.  The timeout period elapsed prior to
obtaining a connection from the pool.  This may have occurred because
all pooled connections were in use and max pool size was reached.

Stack Trace:

[MySqlException (0x80004005): error connecting: Timeout expired.  The
timeout period elapsed prior to obtaining a connection from the pool.
This may have occurred because all pooled connections were in use and
max pool size was reached.]
  MySql.Data.MySqlClient.MySqlPool.GetConnection() +124
  MySql.Data.MySqlClient.MySqlConnection.Open() +223

Microsoft.Practices.EnterpriseLibrary.Data.Database.OpenConnection()
in C:\WorkSpace\Microsoft Enterprise Library January 2006\src\Data
\Database.cs:1222

Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteScalar(DbCommand
command) in C:\WorkSpace\Microsoft Enterprise Library January 2006\src
\Data\Database.cs:588
  DataAccess.UserLogin(String pLoginId, String pPwd, String
pUserHost) +105
  Pages_Login.ButtonLogin_OnClick(Object sender, EventArgs e) +111
  System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs
e) +105
  System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String
eventArgument) +115

System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
eventArgument) +7
  System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler
sourceControl, String eventArgument) +11
  System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
+33
  System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
+5102

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Version Information: Microsoft .NET Framework Version:2.0.50727.42;
ASP.NET Version:2.0.50727.42