I suggest you look at "security software" which may be installed on those
PC. Some of those software (anti-malware, firewall, proxy,...) are
malfunctionning in their interception of socket communication. So first do a
test with every security software disabled.
It may also be a virus or trojan which intercept socket communication for
malware. So here turn all security on, do an complete malware check (update
your software !). Also try to detect root kits which may be there.
--
francois.pie...@overbyte.be
The author of the freeware multi-tier middleware MidWare
The author of the freeware Internet Component Suite (ICS)
http://www.overbyte.be
----- Original Message -----
From: "Merijn Bosma" <bo...@xs4all.nl>
To: <twsocket@elists.org>
Sent: Tuesday, July 12, 2011 1:49 PM
Subject: [twsocket] TWSocket.Close() blocks on certain machines aftersending
UDP
Hi all,
I've been using ICS for a long time, in different environments and on
different machines without problems.
Now I've stumbled upon a problem of which at the moment I don't know how
to find a solution for. It's regarding a snippet which sens data using
UDP.
The relevant code boils down to:
with TWSocket.Create(nil) do
begin
Proto := 'udp';
Port := some port;
Addr := some ip;
Connect();
SendStr('some data');
Close();
Free();
end;
Very simple, and works great.
Now on two machines we have an issue while using this code. The call to
Close() will block for 4 to 6 seconds if:
- I'm sending to an IP address within my own subnet
- There is no actual PC at that IP (doesn't have to be running a UDP
server, just a PC with that ip address).
I've tried with different NIC's, and now I have a NIC on USB, which gives
this problem on the 2 machines mentioned before (Win 7 Pro SP1), but do
not have the same issue on another machine (Win 7 Pro SP1).
Obviously there is something with these two machines, but I'd like to know
what is causing this to give me some control over it. These are brand new
machines, firewall is disabled and all pre installed software is removed.
I also have a support call at the manufacturer, but since there is not
much promising result from them I'm hoping anyone here can give me a
pointer in the right direction.
Thanks and regards!
Merijn
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