I conducted researches:
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My code of a zone
<iframe id='ad7c57e3' name='ad7c57e3' src='http://www.cfin.ru/adserver/www/delivery/afr.php?zoneid=1&target=_blank&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='240' height='400'> <a href='''>http://www.cfin.ru/adserver/www/delivery/ck.php?n=ab665aa7&cb=INSERT_RANDOM_NUMBER_HERE' target='_blank'> <img src='http://www.cfin.ru/adserver/www/delivery/avw.php?zoneid=1&cb=INSERT_RANDOM_NUMBER_HERE&n=ab665aa7' border='0' alt='' /></a> </iframe>
the link (http://www.cfin.ru/adserver/www/delivery/avw.php?zoneid=1&cb=INSERT_RANDOM_NUMBER_HERE&n=ab665aa7) locally works. If to take her in the browser, we will see a banner
But if to insert on the page only a code (<img src='http://www.cfin.ru/adserver/www/delivery/avw.php?zoneid=1&cb=INSERT_RANDOM_NUMBER_HERE&n=ab665aa7' border='0' alt='' />), the banner isn't shown.
probably, in process there are some redirects...
$ curl -I 'http://www.cfin.ru/adserver/www/delivery/avw.php?zoneid=1&cb=INSERT_RANDOM_NUMBER_HERE&n=ab665aa7' HTTP/1.1 302 Found Server: nginx/1.4.4 Date: Thu, 06 Nov 2014 13:39:59 GMT Content-Type: text/html Content-Length: 0 Connection: close X-Powered-By: PHP/5.2.17 Pragma: no-cache Cache-Control: private, max-age=0, no-cache Expires: Mon, 26 Jul 1997 05:00:00 GMT P3P: CP="CUR ADM OUR NOR STA NID" Set-Cookie: OAID=47135b98820525fe07580a6f02660b89; expires=Fri, 06-Nov-2015 13:39:59 GMT; path=/ Set-Cookie: OAVARS[default]=a%3A3%3A%7Bs%3A8%3A%22bannerid%22%3Bs%3A1%3A%222%22%3Bs%3A6%3A%22zoneid%22%3Bs%3A1%3A%221%22%3Bs%3A6%3A%22oadest%22%3Bs%3A177%3A%22http%3A%2F%2Fwww.alt-invest.ru%2Findex.php%2Fru%2Fseminary%2Fprogrammy-seminarov%2Fseminar-po-programme-ai-pas-distantsionnaya-versiya%3Futm_source%3Dcfin%26utm_medium%3Dbanner%26utm_campaign%3Ddist_course%22%3B%7D; path=/ Location: http://www.cfin.ru/adserver/www/delivery/ai.php?filename=trening_240x400_2.gif&contenttype=gif
the status of 302 Not Found - can be it and doesn't allow an ayfreym to receive a banner, but on Location (http://www.cfin.ru/adserver/www/delivery/ai.php?filename=trening_240x400_2.gif&contenttype=gif) the picture is...
That is the script from Revive Adserver on cfin.ru at least correctly gives content...