you have outdated bits, look at the exception thrown for http://deki.selfip.com:81/@api/deki/groups
Code:
<exception><type>System.ArgumentException</type><message>Parameter '?groupnamefilter' not found in the collection.</message><source>MySql.Data</source><stacktrace><frame>MySql.Data.MySqlClient.MySqlParameterCollection.GetParameter (System.String parameterName) [0x00000]</frame><frame>MySql.Data.MySqlClient.MySqlParameterCollection.get_Item (System.String name) [0x00000]</frame><frame>(wrapper remoting-invoke-with-check) MySql.Data.MySqlClient.MySqlParameterCollection<line>:get_Item (string)</line></frame><frame>MySql.Data.MySqlClient.StoredProcedure.Resolve () [0x00000]</frame><frame>MySql.Data.MySqlClient.MySqlCommand.ExecuteReader (CommandBehavior behavior) [0x00000]</frame><frame>MySql.Data.MySqlClient.MySqlCommand.ExecuteDbDataReader (CommandBehavior behavior) [0x00000]</frame><frame>System.Data.Common.DbCommand.ExecuteReader () [0x00000]</frame><frame>System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader () [0x00000]</frame><frame>MindTouch.Data.DataCommand.Execute (System.Action`1 handler) [0x00000]</frame></stacktrace></exception>