Currently data.desi.lbl.gov is down due to power outage maintenance of the underlying Spin service at NERSC. In the meantime, you can browse the DESI data documentation at desi-data.csdc.noirlab.edu/doc and see the status of NERSC at nersc.gov/status.
NERSC staff are actively working on resolving the underlying problems, but we do not currently have an estimate for when the service will be restored. We apologize for the inconvenience.