PMP 450 Upgrade issues

I have an issue with updating some 450 SMs.  I get a couple of errors.

From the unit

Incompatible Software Version With cnMaestro ( - Default Cloud URL)


CNUT complains 

Connection reset by peer: socket write error



Can you provide a bit more information?

What model radio are you trying to update?

What version of software is on it currently? (Homepage screenshot would provide a lot of info)

What version of CNUT are you using?