I belong to a society which has a professionally hosted website which can be accessed by members to get newsletters and other information.
Recently we did a circular to our members and they needed to look at the website to get some things but for a few of them they could not connect to the site and all had the same message "Error 404 Vhost unknown". In all cases they can go to other websites without any issues. Most other people had no issues at all.
So far:
We have contacted the hosting company and so far they can see no reason for this
We contacted the affected people to see if there was anything common about their systems but not apparent commonality
We asked them to access our site via a provided link, via google and from typing URLs into their browsers but they always get the same error message
So far we have learned little
1) the error occurs for any device for any particular person - i.e. they get the error if they use a pc, an I-pad, a mobile etc
2) the issue may not happen at one location (eg from home) but for the same person at another location the error occurs
3) the people use a variety of ISPs including Sky, BT.
It's all starting to be a bit of a mystery but one which we could do without - any ideas please!!!!!