I can not play GTA IV online but other games work fine.
I turned off the modem for a minute and now it works.
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I can help you with it, but first I need to know your provider.
You also need a logon password of your provider(do not post password here).
Sure i have been playing GTA IV for years but now there is some problems i think it it because of nat type but i dont know how to change it to open.
are you selecting the mulitiplayer via the 'cell phone'?