The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, root@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
I have had this before with them when trying to access my online storage. It was just the server my storage was on that was offline. That is probably why some can access and others can't. You may be on one of the servers under maintenance or down.
I called them at the time it happened to me and they told me it would be back up shortly...and it was.
But do contact them as it was me that alerted them to the problem when it happened to me.
Please contact the server administrator, root@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.