Hi,

What do the logs for the app say? Twisted logs a message when it binds a UDP port.

Or, another though, you could put a breakpoint on listenUDP (or socket.bind or something) and then run the process under pdb and look at the stack trace.

You could also try sending some traffic to the port and see what happens. :) Maybe you'll get something back that identifies it or maybe you'll provoke some more logging code somewhere.

Jean-Paul

On Wed, Apr 20, 2016 at 7:33 AM, Phil Mayers <p.mayers@imperial.ac.uk> wrote:

On 20/04/16 01:01, Glyph wrote:

Perhaps this is libc's DNS client? Twisted doesn't do anything like this.

It does something similar with win32reactor IIRC?

http://twistedmatrix.com/trac/browser/tags/releases/twisted-16.1.1/twisted/internet/posixbase.py#L60

...but that binds to 127.0.0.1 not 0.0.0.0

glibc doesn't hold it's DNS sockets open AFAIK - it closes them once the reply is done.

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