In some cases, a webserver will issue an error when a large number of users attempt to load your site in a short period of time. Some servers will issue the error with a surprisingly low number of users – in some cases as few as 10-20 users over a few minutes will cause an error. This seems to be a particularly common problem on IIS servers when asp pages requiring an ODBC connection are served. In other cases, pages will load fine, but users arriving too quickly will cause an undercount due to poor coding of a counting script.