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In my browser (firefox) everything is normal. I can visit every site I want to, load/play flash videos etc.

But I seem unable to be on irc (chatzilla), I can't download anything (qbittorrent, I can dl the .torrent files) and I can't connect to the steam network.

I use windows 7 here.

Anyone has had this issue or knows what I can do?

Edit: I was able to connect to steam. But irc and dl-ing are still not working.

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up vote 1 down vote accepted

This probably indicates that you are NATed somewhere along your connection without UPnP, or the ports wanted by ChatZilla/qBittorrent are explicitly blocked by your administrator.

Ask whoever administrates your network to set up UPnP, or, failing that, triggered forwarding for your MAC address.

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The thing I forgot to mention: everything was fine yesterday, I don't think settings were changed since then. – Mien Jan 28 '11 at 10:39
I still suspect it is NAT/UPnP related. If you're sure nothing was changed, it should still work ;) – Matthieu Cartier Jan 28 '11 at 10:42
Actually, I'm a bit confused about your edit re: steam. Does this mean that you can sometimes connect to Steam, but sometimes not? – Matthieu Cartier Jan 28 '11 at 10:43
No, at the time I was writing the post, I couldn't connect. After posting, I tried everything again, and I was on steam. So steam is fine now, don't ask me why :) – Mien Jan 28 '11 at 10:44
It's not UPnP related. UPnP helps when you need port forwardings TO the INSIDE. NAT helps port forwarding to the OUTSIDE. NAT does connecting to the outside, UPnP is not necessary and only puts manual port forwardings into firewalls (if they support it) so your PC can be connected to from anywhere – sinni800 Jan 28 '11 at 10:57

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