Our main domain is unresponsive today and I am uncertain as to the cause. The last time the site was modified was on Saturday and it was working just fine until this morning (AFAIK).
If there is anyone who can help us track down the source of this issue, it would be greatly appreciated!
Just tried renaming the .htaccess file to .htaccess.bak and this seems to have solved the problem. A new .htaccess file was automatically generated in its place.