Links in emails with tracking shows blank page?


I've moved my installation from cpanel dedicated server to a VPC on AWS.
Everything works perfectly until I send a campaign with links tracking and once they're clicked only a blank page is shown?

I've checked and all file and dir permissions seem correct.

I've also enabled debug, and when I click a link I see the whole debug script but what should I check? Everything seems normal there as well.

Nothing shows up in the Applicaiton log either.

Any clue, anyone?