Denial of Service Policy


The FISO telecon archives are being accessed by an ever-increasing number of users. As a result, we now find it wise to more carefully administer those requests. In particular, we have begun “denial of service” to selected IPs. These IPs are those that


• attempt repeated attacks on our system, and/or have been identified as being malicious

• download the same file many, many times – see, for example, this

• use bandwidth by trying to download the entire 4GB archive (especially things that look like bots)

• are mp3 robots that only go after mp3 files (our system considers it somewhat suspicious when the mp3 file is the only presentation file accessed)

• are associated with websites that we consider "unfriendly" (you should know who they are)


We originally completely blocked social media user agents, since URLs can easily go unconstructively viral that way. Also some social networking news sites, which are not space-specific. Then, as an experiment, we allowed those user agents to access presentations in our archive directly. We ended up serving hundreds of GB per day, in many cases, sending large presentation packages to phones. I don't think people intended to get those large packages. We then tried to redirect all of those user agents to our archive page. That way, they'd still be able to get the presentation files they were looking for, but in two steps. Almost no one did that. We interpret this to mean that almost all requests from social media really aren't that serious, in that requestors don't want to bother taking a second simple step to get the presentation they were after. Evidently very casual requests. So we decided to just go back to blocking those social media user agents totally and offer our bandwidth to serious users.


If you find that your IP has been blocked, please get in touch with us, and we should be able to trace why that happened.


With our new server, we've now been able to set allowable ranges, and now ask browsers that all downloads be done in one piece. That means that if you're used to reading-while-downloading in your browser, you may not be able to do that anymore. Old browsers may not politely obey that request, however.


Our policy for invitation to the real-time (on the telephone) telecon has been outlined in many places, but the short version is here.