Error: Connection to server lost. Quit the app and log in again

I am unable to upload my logs. I receive “Error: Connection to server lost. Quit the app and log in again.” I have uninstalled and reinstalled. I whitelisted ‘warcraftlogs.com’ and turned off ad blockers. There is a similar post, Connection to server lost , but it offers no solution or explanation aside from enabling cookies. I am running Win 7 and Firefox. Help would be greatly appreciated.