We are trying to move a site with a Kartis shop to a different server and have copied down the database and all its files from its previous location.
When I log into the server and view the site with its live url I can see all the product pages, get into the admin area etc. But when I view the site from another computer all I get is a fairly unhelpful
Server Error in '/shop' Application.
Runtime Error
Description: An exception occurred while processing your request. Additionally, another exception occurred while executing the custom error page for the first exception. The request has been terminated.
I have looked at the original installation documentation and ensured that the IIS user has permissions to modify all files in the Shop folder. Is there something I need to re-trigger in the database to make things work? The url has not changed, and neither has the site, except that it is now running on IIS 8.5. Can anyone tell me what I've missed?