...

I can't understand why Max-Daily-Session is an unknown attribute when it's declared in the radiusd.conf and radius loads with no errors.

Because attributes are defined in the dictionaries.

Arguably, the sqlcounter module should look up that attribute, and either complain if it doesn't exist, or else create it. That doesn't happen right now.

Okay, thanks Alan. Should I edit a dictionary file and if so which one? Regards, Sean