[Semibug] Networking question

[Josh Grosse]

On 2018-03-14 14:32, Mark Moellering wrote:

> Everyone,
> 
> I am working with an application that wants to talk to its own external 
> IPv4 address on port 8168.  It keeps giving me an error that it cannot 
> connect.  I am using NAT and when I try and telnet to that port from 
> the same machine, I can verify that it fails. I can, however, connect 
> from different machines. Is this a NAT issue, a routing issue, or 
> something else.  I am hoping it is something simple that more 
> knowledgeable people will be able to answer.
> 
> Thanks
> 
> Mark
> _______________________________________________
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> Semibug at lists.nycbug.org
> http://lists.nycbug.org/mailman/listinfo/semibug

I don't know if you're using OpenBSD/PF as you had planned earlier.  
Even if another OS is involved,
it is possible you are experiencing a problem with Reflection and 
Redirection.  See:

http://www.openbsd.org/faq/pf/rdr.html#reflect

which may give you some insights.