iocage upgrade fails to download metadata files

[dgeo]

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• iocage --version 1.5
• iocage upgrade -r 13.3-RELEASE jail

  Looking up update.FreeBSD.org mirrors... 3 mirrors found.
  Fetching metadata signature for 13.2-RELEASE from update2.freebsd.org... done.
  Fetching metadata index... done.
  Fetching 1 metadata patches. done.
  Applying metadata patches... done.
  Fetching 1 metadata files... failed.
  Command: /tmp/tmp4b7o9d0j -b /iocage/jails/smbfilert1/root -d /iocage/jails/smbfilert1/root/var/db/freebsd-update/ -f /iocage/jails/smbfilert1/root/etc/freebsd-update.conf --not-running-from-cron --currently-running 13.2-RELEASE -r 13.3-RELEASE upgrade failed!

In fact, phttpget process is unable to resolve any name when HTTP_PROXY exists and is empty…