Permissions for OleDb to an As400

I have a store procedure written in VB.NET to access an AS400 using System.Data.OleDb. I created the key for the procedure as a .pfx file and before adding the code to access the AS400, I tested it against a SQL Server database and it worked fine. When I added the code to access the AS400, I get the following error:

A .NET Framework error occurred during execution of user defined routine or aggregate 'ap_mapics_Data':

System.Security.SecurityException: Request for the permission of type 'System.Data.OleDb.OleDbPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

System.Security.SecurityException:

at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet)

at System.Security.PermissionSet.Demand()

at System.Data.Common.DbConnectionOptions.DemandPermission()

at System.Data.OleDb.OleDbConnection.PermissionDemand()

at System.Data.OleDb.OleDbConnectionFactory.PermissionDemand(DbConnection outerConnection)

at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)

at System.Data.OleDb.OleDbConnection.Open()

at ProImage_Procedures_Test.StoredProcedures.ap_mapics_Data()

OleDbPermission is only available to assemblies deployed with an UNSAFE CAS permission set grant. Given that your code worked against what is presumably another SQL Server database, I'm guessing that your assembly is deployed with an EXTERNAL_ACCESS grant. If you want more information about the permissions granted at each level, see http://bordecal.mvps.org/Nicole/SqlClrCas/SqlClrCasSpeculations.htm.