The wording is correct. Disabling TCP breaks it per RFC, the server
might always respond with UDP but how does a UDP packet arrive as an
answer to a TCP request? I would not think to tell you how to set up
your DNS servers, but network diagnostic messages should be written to
comply with the RFCs.

Karl

On Wed, 2006-08-23 at 11:04 +1200, Jason Haar wrote:
> This DNS checks says:
> 
> "A DNS server is running on this port but
> it only answers to UDP requests.
> This means that TCP requests are blocked by a firewall.
> 
> This configuration is incorrect: TCP might be used by any
> request, it is not restricted to zone transfers.
> Read RFC1035 or STD0013 for more information."
> 
> 
> We run tinydns and ensure our DNS records are always small enough to fit
> within a single UDP packet - so we deliberately disabled DNS TCP.
> 
> I think this wording should be changed to " This configuration might be
> incorrect, depending on the type of DNS data the server returns..."
> 

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