Can you try accessing the link from someone else's machine? If still not successful, please check with Basis to make sure that server name and port number are correct.
For Kix code:
Can you please check out this blog? Barcodes in SAP with the Barcode Writer in Pure Postscript update
Or else, you can simply install the KIX code font https://aur.archlinux.org/packages/ttf-kix/, and then just use that in your smartform character format.
Thanks,
Juwin