id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host
17556,Virtual Router makes TCP,RolandMinde,,"1. A TCP port forwarding is configured.
2. The guest system is running.
3. The application on the guest system, normally listening on this port, is not running.
4. Trying a TCP connection from outer network succeeds.
5. After sending the first message over this connection, the connection is closed from partner site.

This behavior seems incorrect, because a router supports level 3 and may not serve level 4 TCP connections.
The expected behavior is an instant rejection of the connection establishment.
",defect,closed,network/NAT,VirtualBox 5.2.6,wontfix,,,Linux,Windows