I am having the same problem with password protected pages. We are using GoDaddy too and they couldn’t figure it out. I have been looking at old posts on here about a year ago on the same issue and seems they all point to GD.
After I enter password I get the page:
No data received
Unable to load the webpage because the server sent no data.
Reload this webpage
Press the reload button to resubmit the data needed to load the page.
Error code: ERR_EMPTY_RESPONSE
Renier