Sylvain Delhomme wrote on 25 September 2008 13:57:
>> The "associated udp" socket is an internal thing managed by winsock; it's
>> standard OS behaviour and happens to native win32 programs as well.
>
> I've just ported my small app to Winsock and I did not see this.
Hmm, odd, but it's a well known phenomenon. Here's an example showing
solely the use of cmd.exe and iexplore.exe; Cygwin not involved at all except
for the diff command at the end.
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\dk>netstat -ano > before.txt
C:\Documents and Settings\dk>"\Program Files\Internet Explorer\iexplore.exe"
C:\Documents and Settings\dk>netstat -ano > after.txt
C:\Documents and Settings\dk>diff -pu before.txt after.txt
--- before.txt 2008-09-25 14:28:39.829644300 +0100
+++ after.txt 2008-09-25 14:28:50.955000300 +0100
@@ -27,6 +27,7 @@ Active Connections
UDP 127.0.0.1:1025 *:* 600
UDP 127.0.0.1:1028 *:* 1108
UDP 127.0.0.1:1056 *:* 1052
+ UDP 127.0.0.1:2301 *:* 2388
UDP 127.0.0.1:2584 *:* 1580
UDP 192.168.1.150:123 *:* 1580
UDP 192.168.1.150:137 *:* 4
C:\Documents and Settings\dk>
As you see, even when not showing a page (launching iexplore.exe =
about:blank on my machine), it has an open UDP socket.
Sorry, I don't have a source right now; I'll keep looking. I'm writing off
the top of my head, and I just remembered that possibly it's not even a
loopback connection, it may just be some artifact of windows netstat. I'll
post again if I can find a reference.
>> It's
>> used for some kind of internal loopbacky rpc-ish thingy and you can
>> ignore it.
>>
>
> Could you provide me more info about this because it can be quite
> annoying in a real application ?
What kind of "annoying"? It does no harm and requires no action on your
part TTBOMK.
cheers,
DaveK
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