here's some things to check to see if they are correctly configured:
1/ Do you have a active, validated SSL cert? Most host provide a basis level free.
2/ If, when you have an SSL change your System > Settings > Store Details Store URL AND Store SSL URL to
https://xxxxxx3/ If using SEO - System > Settings > system Use SEO's be sure you have changed your htaccess associated with your AbanteCart installation from .htacess.txt
to .htaccess. (note the trailing dot should remain)
4/ If you installation of AbanteCart is in a subfolder - besure to add then into the .htaccess. file - instructions are with in the file.
5/ Depending on your server configuration you may or may not need to have a cPanel redirect set.
See if any of these things give you a help. It is important that you have everything configured properly