However, a dienice routine does confirm that the error is on their side, not your browser.
That is quite true. However, there is no need to give any more information than that the problem was indeed server-side, how to contact the administrator, what information to provide when contacting the admin, and what to do instead (such as try again later). I usually find that when I get the time and date of when an error occurred, I can find out what went wrong by looking at the error-log. Of course, often enough the user will be pissed off, to various degrees, but against that, hardly any dienice-routine helps ... (:
There are nights when the wolves are silent and only the moon howls. - George Carlin