I also cannot reproduce. Does this still happen?
Does it happen in your web browser with the URLs you gave? Does it still happen if you change
https: in the browser?
If HTTPS works, but HTTP doesn't, then it is highly likely to be an issue with your ISP's network configuration. It is possible for ISPs to arbitrarily control and/or corrupt the behavior of HTTP traffic (e.g., to cache stale versions and states, which we have unfortunately seen happen at major universities for example), but not HTTPS.