After I upgraded my system to use NHibernate 2.1, I got that error on
Burrow :

InvalidCastException: Cannot convert object 'Npgsql.NpgsqlConnection'
to 'System.Data.Common.DbConnection'...

I´m using NH with Postgres (Npgsql) ...
My config:

<property
name="connection.provider">NHibernate.Connection.DriverConnectionProvider</
property>
                <property
name="connection.driver_class">NHibernate.Driver.NpgsqlDriver</
property>
                <property
name="connection.connection_string">Server=x;Port=5432;User
Id=x;Password=x;Database=x; CommandTimeout=600;</property>
                <property name="connection.isolation">ReadCommitted</property>
                <property name="dialect">NHibernate.Dialect.PostgreSQLDialect</
property>
                <property
name="proxyfactory.factory_class">NHibernate.ByteCode.Castle.ProxyFactoryFactory,
NHibernate.ByteCode.Castle</property>

                <property name="show_sql">true</property>
                <property name="connection.release_mode">auto</property>

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