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So, I'm getting this error:

Security Exception
Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

The error happen just when deploying the application to a shared host with medium trust level. It does not happen when there's full trust.

You can see the error here:
http://desktopdatabases.com/default2.aspx

Hi, I have had the very same problem.

I am also in a medium trust env, running Version=3.55.20.0.

My login page was giving me the security error. But then I found that after I accessed a different page which permed a db connection, I was able to log on.
So I have put the following in the global.asax file application_start event and now all is fine again...apart from my other bugs

/* For some reason, this stops the security error seen in Medium Trust Environment */
CoreLab.MySql.MySqlConnection connection =
new CoreLab.MySql.MySqlConnection(ConfigurationManager.ConnectionStrings["cocConnectionString"].ConnectionString);
connection.Open();

CoreLab.MySql.MySqlCommand command = new CoreLab.MySql.MySqlCommand("Select '' from aspnet_profiles;", connection);
command.ExecuteNonQuery();

Well, in my case, I'm not even using asp.net membership!.

It is a simple query to a test table.

cesarvegamx, are you granted SocketPermissions by your hosting parties?

Yes, see the web_mediumtrust.config on my provider:

No, it is a shared hosting.
Yes.

When exactly that error occurs? On Connection.Open() call?

It seems it is originated here: CoreLab.MySql.MySqlDirectFactory.CreateConnection()
You can see the stack trace in this sample site:
http://desktopdatabases.com/default2.aspx

Could you provide me with your web.config file and medium trust config file on the shared host?

The medium trust config file is in the post above.
The web.config was already sent by email on friday, together with the whole repro application.

Your project is received and is being investigated.

We have fixed the problem in MySQLDirect .NET beta. Look forward to the release, which is gonna be available this month.