My mother spends some time on the Korean community Naver.
It's all been working perfectly until we bought her a new PC recently. Now, after browsing around a bit on the domains section.blog.naver.com and blog.naver.com, we're unable to connect to the site. The rest of the naver.com site works well.
Internet Explorer shows the message 'Internet Explorer cannot display this website' as if we had network problems, and other browsers just show the timeout message.
Weird thing is that this applies to all computers on this network. We have also tested it on another network, where it works perfectly well.
Our router is a 3Com OfficeConnect. The WLAN is setup so that a computer's MAC address must be in a list to use it, and we use no encryption. So all we did during setup of her new computer was to add its MAC address to that list in the router settings.
Note that the other computers on the same network tested are wired.