I just discovered on my Joomla websites the same problem with using Akeeba Admin Tools for Joomla (www.akeebabackup.com/products/admin-tools.html) together with a map from Zh YandexMap. The problem is that in the Akeeba Admin Tools you can set a security feature to password protect the Administrator page. This protection however, will appear on all pages using your map solution. Please look into it. I am no coder but I got the following suggestions from Sitegrounds experts.
Please note the password protection shows up on the homepage because there's a resource that's trying to load something from the "administrator" directory where the actual password protection is set. What I can recommend as alternatives is:
- Deactivating the component com_zhyandexmap
- Disabling the password-protection on /administrator
Hope you can fix this bug.