Connection between two firewalled computers?

Is it possible to do this? I want to establish a connection between two computers, but I can't portforward any ports on either of the routers, so can't do direct client->server connection. Is there any method that exists so that they can connect to each other?

I was thinking there might be a service available that hosts a main server, where two clients can connect to that server then transfer data between each other, but I haven't found anywhere that does this.

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Originally Posted by IniX

Is it possible to do this? I want to establish a connection between two computers, but I can't portforward any ports on either of the routers, so can't do direct client->server connection. Is there any method that exists so that they can connect to each other?

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They wouldn't be very good firewalls if they allowed this behavior.

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I was thinking there might be a service available that hosts a main server, where two clients can connect to that server then transfer data between each other, but I haven't found anywhere that does this.

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This is the only way I know of. You need a third party to act as a proxy. Instant messengers and such take this approach. I don't know of any generic servers that allow this arbitrarily though.