[erlang-questions] HTTP requests and the meaning of eaddrinuse

Oscar Hellström oscar@REDACTED
Fri Jan 30 12:48:32 CET 2009

The error means that you've exhausted all available ports on a network

On Linux, an application without root privileges can only use ports >
1024, and up to 65535. This means that if you have 64511 open TCP
connections, it's impossible to open a new outgoing connection. On
windows I don't know how many sockets a user process can actually use,
but I guess there is some kind of setting for this. Other applications
using the network interface of course also affects this, since the ports
are not unique per process.

Philip Fennell wrote:
> Hello,
> I've been putting together some Erlang programmes to load a potential
> very large set of data into CouchDB and when using:
> http:request(put, {"", [],
> "application/json", {"_id": "00_CF07", "SeriesTitle": "Harold Wilson",
> "FirstTransmissionDate": "2000-01-01"}}, [], []).
> as an example, I do get, from time-to-time when I'm recursing over a
> large and deep directory structure, an atom returned by http:request of:
> eaddrinuse
> However, I've been unable to find any reference to its meaning. Could
> someone tell me what the error eaddrinuse actually means, and for that
> matter why it might be happening.
> I'm using Erlang R12B-5 on Windows XP SP2 (but I'm sure that doesn't
> have anything to do with it).
> Regards
> Philip Fennell
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Best regards

Oscar Hellström, oscar@REDACTED
Office: +44 20 7655 0337
Mobile: +44 798 45 44 773
Erlang Training and Consulting

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