I have several self hosted webpages. And one of them seems to have stopped working for a single person. He is able to successfully connect and use one of the two webpages and not the other. Both of these webpages are hosted by the same (Synology NAS) device in my home. And the other webpage was also working for him about one month ago. Other people seems to have no issues connecting to either webpage (tested several places and countries).
Here is what we have tried so far:
Any ideas as to what might be wrong would be appriciated.
We eventually discovered that we were able to connect if we specified the default https port at the end of the url. Which was really strange. That should by no means be required unless you are using a non-standard port.
Anyways, I don't know what causes this issue on multiple devices. But apparently it works again with the normal url as well after running the following command.
ipfonfig /flushdns