Today I came back from my Christmas holidays with the precise idea of rewriting the Fast Flux Tracking module from scratch. In fact, in the last days I observed strange behaviors during its working when the number of domains to monitor exceeded a few thousands. A deep investigation of the code revelead to me the sad truth. While using the monitoring threads I forgot cleaning an object related to asynchronous DNS requests at the thread exit. This lead to a great number of unused socket descriptors flying around thus causing the process to quickly hit the limit of the operating system. Three lines of code were added and everything works fine with about 24000 domains monitored right now. Moreover I think few improvements in the module are on the way. Stay tuned!