s390(x) mirror failures on install

Hello,

I am trying to install *any* Debian s390 (currently 8.11) version on 
Hercules.  I successfully boot the installer and configure the network, 
and successfully ssh from my host system to the installer, but no matter 
which mirror I pick I consistently get failures claiming the mirror does 
not support the release.

/var/log/syslog has the following:

Jan 19 01:09:55 main-menu[243]: INFO: Menu item 'choose-mirror' selected
Jan 19 01:09:55 anna-install: Queueing udeb apt-mirror-setup for later 
installation
Jan 19 01:10:28 choose-mirror[1248]: DEBUG: command: wget -q 
http://mirrors.kernel.org/debian/dists$
Jan 19 01:10:48 choose-mirror[1248]: DEBUG: command: wget -q 
http://mirrors.kernel.org/debian/dists$
Jan 19 01:11:08 choose-mirror[1248]: DEBUG: command: wget -q 
http://mirrors.kernel.org/debian/dists$
Jan 19 01:11:28 choose-mirror[1248]: DEBUG: command: wget -q 
http://mirrors.kernel.org/debian/dists$
Jan 19 01:11:48 choose-mirror[1248]: INFO: mirror does not have any 
suite symlinks
Jan 19 01:11:48 choose-mirror[1248]: DEBUG: command: wget -q 
http://mirrors.kernel.org/debian/dists$
Jan 19 01:12:08 choose-mirror[1248]: WARNING **: mirror does not support 
the specified release (jes$
Jan 19 01:25:03 main-menu[243]: (process:1241): wget: bad address 
'mirrors.kernel.org'
Jan 19 01:25:03 main-menu[243]: (process:1241): wget: bad address 
'mirrors.kernel.org'
Jan 19 01:25:03 main-menu[243]: (process:1241): wget: bad address 
'mirrors.kernel.org'
Jan 19 01:25:03 main-menu[243]: (process:1241): wget: bad address 
'mirrors.kernel.org'

What am I doing wrong ?

TIA