Permission error on server 2003 share located on other computer with full trust

I don't know if this i under the right folder. If not feel free to move this topic..
I have a website hosted on a share located on another computer and I keep getting an error when trying to run (login to) the website (even from localhost on the server). It runs fine and displays the pages perfect in the begining but when trying to use a dll in login or other database-actions the followering error is thown:
MySql.Data.MySqlClient.
MySqlPool.CreateNewPooledConnection()
   at MySql.Data.MySqlClient.
MySqlPool.GetPooledConnection()
   at MySql.Data.MySqlClient.
MySqlPool.TryToGetDriver()
   at MySql.Data.MySqlClient.
MySqlPool.GetConnection()
   at MySql.Data.MySqlClient.
MySqlConnection.Open()
   at my.app.DataRessource.GetConnection()
Request for the permission of type
'System.Net.DnsPermission, System, Versio ...