Hello Moorie,
As rest of the aspx pages are working fine but only the pages which uses back end database are facing this issue hence it seems to be a issue with your database user or its permissions.
We need to check your database and the connection string you have used.
Can you please email us at
windows@eukhost.com with exact links which are not working properly and the database name with the corresponding login details so that we can look into the issue further.