Unable to jam with more than two participants

[Dimitri Muskens]

Dimitri, do you consider NOT port forwarding as essential?  It appears that JK has gone to the trouble of advising port forwarding, and creating an interface to specify parameters and advise users on Port Forwarding setup.  I haven't found that Port Forwarding makes any difference, but I'd like to know, technically, why you strongly advise against it.  Just trying to understand the reasoning behind it.  Thanks!

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Please don't get me wrong. I don't "strongly advise against it" in general. But, it has helped a fair few people with the same issues as the OP to just let UPnP take care of the traffic on their LAN.
You are right though, I do not consider it essential  (either way) . It's an additional 'tool' for people/situations that have use/need for these measures. It can work no issues.