"Common KVM Processor" is a generic CPU name that some virtualization systems provide to client VMs.  You can typically override this in your hypervisor to tell the client system the actual CPU type.  Unfortunately, the term "Common KVM Processor" doesn't tell us anything about your CPU's capabilities. 

The URL that you're generating is the one to the webgateway.  Do you have the webgateway running on port 443 of the same IP address as your IRIS server?

Are you pulling form a x86 or ARM machine?  I've just pulled the image a dozen times from a number of networks without any problem from my x86-based machine.  Which leaves it as either a problem with the ARM image, your network, or something on your machine (anti-virus system perhaps?)