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Mac OSX Firewall plays trick on Skype and online gamers

Some Leopard (opens in new tab) users have reported facing problems when using Skype or Online Games like World of Warcraft.

German-based Heise Security points its finger to Mac OS X Leopard's firewall as the root of all the problems with the issue originally found by German users back last week.

Unlike Windows Operating Systems, Apple users cannot change program privileges which can cause problems with applications like Skype.

The popular VoIP software and many legitimate ones need to change their code as they run which causes Leopard's firewall to raise a flag and block them because it mistakenly assumes that a malware has changed the size of the running app.

As Heise (opens in new tab) puts it, "The background to all this is that, in contrast to Tiger, the firewall in Leopard no longer operates at the packet level but rather it works with applications, to which it permits or denies specific network activities."

Signature-based defences have been criticised by security companies like Tier-3 for being easily fooled by decade old scripts.

Désiré Athow

Désiré has been musing and writing about technology during a career spanning four decades. He dabbled in website building and web hosting when DHTML and frames were en vogue and started writing about the impact of technology on society just before the start of the Y2K hysteria at the turn of the last millennium. Following an eight-year stint at where he discovered the joys of global tech-fests, Désiré now heads up TechRadar Pro. Previously he was a freelance technology journalist at Incisive Media, Breakthrough Publishing and Vnunet, and Business Magazine. He also launched and hosted the first Tech Radio Show on Radio Plus.