Re: ncat server->client communication fails

[David Fifield <david () bamsoftware com>]

On Wed, Jun 02, 2010 at 01:45:53PM +1000, Felipe Alvarez wrote:
> Ncat version 5.00
> All on localhost
>
> SERVER: ncat -l 31400
> CLIENT:    ncat localhost 31400
>
> This "chat" works only one way, and tcpdump "port 31400" confirms it.
> The client can send to server "hello world" and when server replies,
> it doesn't not show up in tcpdump, or on the CLIENT screen.  What's
> wrong?
>
> I tried the --chat command, and --verbose doesn't give clues.
> I've read through http://nmap.org/ncat/guide/ncat-chat.html
>
> As a test, I tried:
> SERVER: yes | ncat -l 31400
> CLIENT:  ncat localhost 31400
>
> and nothing shows up on either screen (but ram usage goes up slightly,
> around 20%)

These commands all work for me with Ncat 5.00. Try running with -vvv to
get more debugging information, and post the output on the server and
the client.

It's also worth trying a newer version, like 5.21 from
http://nmap.org/download.html.

David Fifield
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