VOCDetection - error, NO route to host

I used torch.utils.datasets.VOCDetection, but there was error message
how can i address this error?

There was no error when I used it a month ago.

train_ds = VOCDetection(path2data, year=‘2007’, image_set=‘train’, download=True

It seems that the download fails. It seems that http://host.robots.ox.ac.uk/ is down, at least I also cannot access it.