here is my NATNegTest results:
Using server nntest.cnc-online.net:30000
Bound to local port 52754
Bound to local alternate port 52755
Resolving hostname 'nntest.cnc-online.net'...
Resolved server host to be '37.247.49.213'
Sending client INIT from port 52754 to nntest.cnc-online.net:30000
Received server INIT [839376]
Our public address is 2.224.161.122:50249
Sending client INIT2 [839376] from port 52755 to nntest.cnc-online.net:30000
Received server INIT2 [839376]
Our alternate public address is 2.224.161.122:64529
Sending cient START [839376] from port 52755 to nntest.cnc-online.net:30000
Received server START [839376]
Server extra port is 40000
Sending client PING [839376] from port 52754 to nntest.cnc-online.net:40000
===========
FAILURE
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Failed to receive any pings from nntest.cnc-online.net:40000.
It appears your router and/or connection is not capable of NAT negotiation.
==> You will need to use port forwarding and possibly configure a static port.