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

Philip Fennell <>
Tue Feb 10 10:21:38 CET 2009


Per wrote:

> Now if you have 5000 lines with TIME_WAIT... - or at least 
> a "large number", which may be the (default) size of the 
> "port range" (as discussed in the thread) on Windows - you 
> probably have the reason.

Yes I believe that was the case.

For anyone who is interested, I get one of our clever Ops chaps to
create me the following 5 lined .reg script that updates the registry:



Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]
"MaxUserPort"=dword:00001388
"TcpTimedWaitDelay"=dword:0000001e



Where:
MaxUserPOrts = 5000
TcpTimedWaitDelay = 30 (seconds I presume, or maybe milliseconds?)

Once I double-clicked on the file and re-started my PC I no longer got
any eaddrinuse errors.

Just that that might be useful to someone.


Regards and thanks for everyone's help,

Philip Fennell



-----Original Message-----
From: Per Hedeland [mailto:] 
Sent: 06 February 2009 08:02
To: Philip Fennell
Cc: 
Subject: Re: [erlang-questions] HTTP requests and the meaning of
eaddrinuse

"Philip Fennell" <> wrote:
>
>I must admit that a lot of that was way outside of my area but from 
>what I gather I'm running-out of available ports, and netstat tells me,

>by its last line of output:
>
>> TCP    PC-S051049:5000        pal.sandbox.dev.bbc.co.uk:5984
>TIME_WAIT
>
>That I have 5000 ports in the TIME_WAIT state.

Unless netstat output on Windows is radically different from *nix, it
doesn't mean that - each line represents (at most) one connection. The
above would represent a connection between a local port 5000 and a
remote port 5984, that is in the TIME_WAIT state (i.e. a potential
"troublemaker").

Now if you have 5000 lines with TIME_WAIT... - or at least a "large
number", which may be the (default) size of the "port range" (as
discussed in the thread) on Windows - you probably have the reason. In
which case one way to avoid it may be to increase the port range - if
it's possible on Windows, google can probably tell you how it's done.

--Per

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