I’ve never had this problem before because the last time that I had to use IIS was 5-7 years ago. So since my client is already locked into using IIS, I had no choice but to fix it. After searching for a while, I just had to change the MySQL hostname to 127.0.0.1.

So open up wp-config.php find the line,

and change it to

Should solve it, if it doesnt, might be something more sinister and complicated.