query source, your thoughts

[Storm]

I have set-up my caching name server with query source as port 53

query-source address * port 53;

As I surf the internet I notice that certain addresses will not resolve.

This is due to misconfigured firewalls, at the auth-name servers, dropping
queries from port numbers less than 1024.

Am I breaking any RFC's by putting in the above line, or is the problem with
the firewalls ?

Cheers

George