Apparently iMob Online’s problems with scaling are not just affecting the app itself anymore, but now a shared Geo-location server used by many iPhone apps has effectively been the victim of a (probably unintentional) DDOS (Distributed Denial of Service Attack) by iMob as well. Here’s a recent forum entry from the gent who runs GeoNames, […]
" />

iMob Online Knocking Other Servers Offline, Breaking Other Apps?

Jan 22nd 2009 by

Apparently iMob Online’s problems with scaling are not just affecting the app itself anymore, but now a shared Geo-location server used by many iPhone apps has effectively been the victim of a (probably unintentional) DDOS (Distributed Denial of Service Attack) by iMob as well.

Here’s a recent forum entry from the gent who runs GeoNames, updating users on (lack of) service availability a couple of days ago:

The problem since yesterday evening is an enormously popular iphone application called iMob. It is hammering the server with > 100 requests per second which has the effect of a DDOS attack. I am trying to get in touch with the developers to have them remove this feature from their application.

In the end, GeoNames was forced to temporarily change its domain name “to protect the server from exessive use by an iphone application” – and this has apparently broken iPhone apps that referenced that domain name.

I learned of all this via a blog post at Peter Boctor’s (creator of the Hot Popcorn iPhone app) web site – hit the jump for more details from his post …

Below is the full text from Peter’s post.

A lot of iPhone applications need to convert a user ‘s location from the latitude/longitude that the iPhone SDK returns into a postal code. This is primarily because a lot of APIs still use postal codes to look up information. This is the case for Hot Popcorn where we look up movie times using either a postal code or city, state.

The popular choice for doing this conversion is GeoNames, a web service run by Marc Wick free of charge under a creative commons attribution license. When an API is free, there have to be limits to set to prevent abuse. GeoNames limits usage in it ‘s terms of service
to 50,000 requests per IP address per day.

But this is a new world with rich clients like the iPhone, each with their own IP addreess. So what happens when a free popular iPhone game like iMob uses GeoNames? Mayhem.

iMob Online is currently #5 in the Top Free Apps on iTunes and this has essentially
brought down GeoNames:

The problem since yesterday evening is an enormously popular iphone application called iMob. It is hammering the server with > 100 requests per second which has the effect of a DDOS attack. I am trying to get in touch with the developers to have them remove this feature from their application.

This forced Marc to take down the server:

We have temporarily removed the domain ws.geonames.org from the dns setting to protect the server from exessive use by an iphone application. You can access the server with the domain ws5.geonames.org

Now any iPhone application trying to use GeoNames will fail. Thanks iMob!

I guess all is not so bright and shiny in the brave new world of iPhone MMORPG apps 🙁

Continue reading:

TAGS: