Topic on Talk:Tom Clancy's Splinter Cell: Blacklist
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@OP Can you try to use a VPN along with your friend (a one w/o blocked ports at best)? Eventually mobile connection to exclude problem with provider? Probably you also tried to disable firewall, enabling UPNP on router. Generally keeping NAT open/necessary ports open/forwarded only if your provider doesn't block it (mobile networks usually do it unfortunately).