for intranet connection, you can
- download my WebPortal mod
- edit .addons/webportal/vhosts.conf
- add
www.msftncsi.com www.kobo.com to vhosts.conf
- download
www.msftncsi.com/ncsi.txt and
www.kobo.com/buildinfo.xml and place in .addons/webportal dir
- reboot
After reboot, when Kobo firmware checks for
www.msftncsi.com/ncsi.txt (old firmware) or
www.kobo.com/buildinfo.xml (new firmware), it should find the locally served file instead and proceed with the connection.
( I should update the WebPortal mod to include a separate archive with this hack pre-enabled to make it easier... )
I'm not sure if there is another patch for intranet wifi that doesn't involve WebPortal