[erlang-questions] Becoming distributed on Windows

Avinash Dhumane <>
Fri Apr 6 12:23:08 CEST 2012


On my Windows system (with Cygwin shell started as "Run As  
Administrator"), "epmd -daemon" does not seem to work:

-------------------
$ netstat -a |grep 4369

 ~
$ epmd -daemon

 ~
$ netstat -a |grep 4369

 ~
$ epmd -names
epmd: Cannot connect to local epmd

-------------------

If started without -daemon option (or, with -sname to erl), it does work:

---------
 ~
$ epmd&
[1] 4908

 ~
$ netstat -a |grep 4369
   TCP    0.0.0.0:4369           Karma:0                LISTENING

 ~
$ epmd -names
epmd: up and running on port 4369 with data:

 ~
$

------------

So, the 'econnrefused' error occurs when 'erl' is started without  
distributed mode (which is a requirement of the application) and when  
net_kernel:start() is called to become distributed (again, a requirement  
of the application, which controls the degree of distribution).

Currently, I will live with running epmd without -daemon option (but in  
the background) as a step of the startup sequence in setting up the  
application environment and preconditions, till further understanding  
arrives.

Thanks

On Fri, 06 Apr 2012 13:40:34 +0530, Dmitry Klionsky  
<> wrote:

> On 04/06/2012 10:59 AM, Dave Cottlehuber wrote:
>> On 6 April 2012 09:36, Avinash Dhumane<>  wrote:
>>> When Windows is booted up, below undesirable is observed. Please.  
>>> Thanks.
>>>
>>> -----------------------------
>>>  ~
>>> $ erl
>>> Eshell V5.8.3  (abort with ^G)
>>> 1>  net_kernel:start([abc, shortnames]).
>>>
>>> =INFO REPORT==== 6-Apr-2012::12:47:29 ===
>>> Protocol: "inet_tcp": register error: {{badmatch,{error,econnrefused}},
>> You'll likely need to allow epmd and erl*.exe permissions through
>> windows firewall.
>> Depending on your setup&  if you've a custom firewall installed there  
>> are other
>> erl* binaries that might require it.
>>
>> Let us know what works in the end.
>>
>> Thanks
>> Dave
>> _______________________________________________
>> erlang-questions mailing list
>> 
>> http://erlang.org/mailman/listinfo/erlang-questions
>
> I'd say this isn't the firewall who causes the problem, because the  
> net_kernel:start succeeds eventually.
> Seems like the epmd isn't yet started and this is why you get the  
> {error,econnrefused}.
>


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