Per the Wind River Pulsar Linux Quick Start Guide that came with my MicroZed board, I attempted to log in to Wind River's server with my terminal program per the script below.
192.168.1.10 login: root
The "root" username seems to be correct, but Wind River's suggested password did not work.
I discussed this with a Wind River applications engineer who had never heard of MicroZed or Wind River's Smart Update. He suggested contacting Avnet.