my abantecart login 0r checkout page is not opening showing webpage is not available
Did you enable SSL? Id you did, possibly it is not configured correctly.
1. Check that SSL (HTTPS) URL setting is correct in your AbanteCart (system -> settings -> details)
2. Check that your hosting is working if you access this URL and it points back to AbanteCart installation
You can check this with your hosting provider
Do you see anything in your error log? System / Logs / Error log