One of my client had issues with his hosting, he uploaded all the files on his hosting but nothing was but blank page was coming. All settings looks good. After looking into the logs, I can see only “AH01071: Got error ‘Primary script unknown'”.
Hosted on AWS Ubuntu server with Plesk. Site was in WordPress.
We had recently installed Apache modspeed plugin on the server from google. I came to our notice that many site were having same problem on the server when modspeed was on.
As soon as we turn off mod speed, all the sites having issues were up and running. SO it turned out to be that Mod PageSpeed was causing issue.