We had a Godaddy domain IP address change and afterwards we unable to access sites we had in a sub-domain. After the IP issue was resolved the sites still didn’t come up. The page read

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 2348617 bytes) in

This article solved our issue.

http://www.wpbeginner.com/wp-tutorials/fix-wordpress-memory-exhausted-error-increase-php-memory/

We just had to add the following line to the “wp-config.php” file.