Do you see any (or all) of these exceptions (NHibernate.ADOException) in you NHibernate-based web application?
could not execute query failed to lazily initialize a collection, no session or session was closed Transaction not successfully started The server failed to resume the transaction. Desc:86000002dc.
If you do, it might be a good idea to make sure you don’t store any ISession-references anywhere. If you do there’s a great risk that something goes wrong if two threads (i.e. two requests) are using the session at the same time as the NHibernate session implementation is not thread safe.
Instead, do this when an ISession is needed:
ISession session = SessionFactory.Factory.GetCurrentSession();
That code will get the session from the current context (which of course must be updated by your code, look here for more info).