Yes. You described it exactly.
I don’t know what Barracuda technology they are using.
The browser displays the following error page (note that the error message refers to a URL that seems to be only a forward slash):
(The top left of the window has the Barracuda logo)
ERROR
The requested URL could not be retrieved
The following error was encountered while trying to retrieve the URL: /
Invalid URL
Some aspect of the requested URL is incorrect.
Some possible problems are:
– Missing or incorrect access protocol (should be “http://” or similar)
– Missing hostname
– Illegal double-escape in the URL-Path
– Illegal character in hostname; underscores on not allowed.
Your cache administrator is