Created php page in wordpress – Error Page can not be reached

I want to create a folder within wordpress site at root and add a php page abc.php with simple code like
<?php echo "Test php page." ?>
But when I try to run this page like this http://mydomainname.com/Myfolder/abc.php
it gives error "This site can’t be reached"
Why it is not reading my php page. I did the same on my another domain and it is working fine.
Please help.