It don't work here either
W: Failed to fetch http://ftp.spline.de/pub/siduction/extra/dists/unstable/InRelease Could not connect to ftp.spline.de:80 (130.133.110.66). - connect (113: No route to host)
W: Failed to fetch http://ftp.spline.de/pub/siduction/fixes/dists/unstable/InRelease Unable to connect to ftp.spline.de:http:
W: Some index files failed to download. They have been ignored, or old ones used instead.[/code