Hello,
I'm developing a C# - windows forms application. To get some information
for my application, I'm connecting to an URL, wich gives me XML
generated using php.
With 90% of the users, this code just works fine: -
-
WebRequest request = WebRequest.Create(URL);
-
-
try
-
{
-
request.Timeout = 50000;
-
WebResponse response = request.GetResponse();
-
}
-
catch(Exception ex)
-
{
-
WriteToLog(LogType.Info,ex.Message.ToString());
-
response = null;
-
}
-
-
But with some users, I get an exception saying: The underlying
connection was closed: Unable to connect to the remote server
I'm sure that there is no firewall on, and I've asked the user to
disable any proxy settings...
Is there something that I'm overseeing or that can be improved to this code?
thanks in advance,
Kristof 22  3265 
This can happen when the request lacks something like for example a cookie.
Are there other ways in which you can connect? If so, have a look with
ethereal what goes over the wire. That sometimes gives the required
information.
"Kristof Thys" <Kr**********@l uc.ac.be> wrote in message
news:d1******** **@ikaria.belne t.be... Hello,
I'm developing a C# - windows forms application. To get some information
for my application, I'm connecting to an URL, wich gives me XML generated
using php.
With 90% of the users, this code just works fine:
- WebRequest request = WebRequest.Create(URL);
- try
- {
- request.Timeout = 50000;
- WebResponse response = request.GetResponse();
- }
- catch(Exception ex)
- {
- WriteToLog(LogType.Info,ex.Message.ToString());
- response = null; }
-
But with some users, I get an exception saying: The underlying connection
was closed: Unable to connect to the remote server
I'm sure that there is no firewall on, and I've asked the user to disable
any proxy settings...
Is there something that I'm overseeing or that can be improved to this
code?
thanks in advance,
Kristof
Kristof,
Your code is fine. It's the URL that you are connecting to that is making
your code throw an exception. I am assuming this is your server that is
giving you the XML; if so then I would make sure that the server is working
properly and that it's never loosing connection.
-- in**@dowhileloo p.com http://dowhileloop.com website development http://publicjoe.dowhileloop.com -- C# Tutorials
"Kristof Thys" <Kr**********@l uc.ac.be> wrote in message
news:d1******** **@ikaria.belne t.be... Hello,
I'm developing a C# - windows forms application. To get some information
for my application, I'm connecting to an URL, wich gives me XML
generated using php.
With 90% of the users, this code just works fine:
- WebRequest request = WebRequest.Create(URL);
- try
- {
- request.Timeout = 50000;
- WebResponse response = request.GetResponse();
- }
- catch(Exception ex)
- {
- WriteToLog(LogType.Info,ex.Message.ToString());
- response = null;
- }
-
But with some users, I get an exception saying: The underlying
connection was closed: Unable to connect to the remote server
I'm sure that there is no firewall on, and I've asked the user to
disable any proxy settings...
Is there something that I'm overseeing or that can be improved to this
code?
thanks in advance,
Kristof
Yep.
When writing these types of apps its important to not presume that the
URL will be available. Its good practice to also double check the
formatting of the XML, but that's not what's happening here.
Mezzrow wrote: Yep.
When writing these types of apps its important to not presume that the
URL will be available. Its good practice to also double check the
formatting of the XML, but that's not what's happening here.
The strange thing is, that with 19 of the 20 testusers, it is working
just fine. But with one user, it keeps on giving this error...
I believe it must be some kind of setting but I kind find out wich one...
It isn't the firewall, he doesn't have a proxyserver set, and the server
works fine, because at the same moment I'm able to connect...
So I'm really stuck...
What difference does ethereal show between a successfull and a failed
attempt?
"Kristof Thys" <Kr**********@l uc.ac.be> wrote in message
news:d1******** **@ikaria.belne t.be... Mezzrow wrote: Yep.
When writing these types of apps its important to not presume that the
URL will be available. Its good practice to also double check the
formatting of the XML, but that's not what's happening here.
The strange thing is, that with 19 of the 20 testusers, it is working just
fine. But with one user, it keeps on giving this error...
I believe it must be some kind of setting but I kind find out wich one...
It isn't the firewall, he doesn't have a proxyserver set, and the server
works fine, because at the same moment I'm able to connect...
So I'm really stuck...
I'm not that familiar with ethereal, but I tried installing it (and
wincap3.1) on my pc... But when I run my program, it doesn't seem to
catpure anything...
I don't have to run it on the server pc do I?
There is always the problem to make a program like this run on someone
elses pc, especially when he's living in Romania...
thx for you help
at wrote: What difference does ethereal show between a successfull and a failed
attempt?
"Kristof Thys" <Kr**********@l uc.ac.be> wrote in message
news:d1******** **@ikaria.belne t.be...
Mezzrow wrote:
Yep.
When writing these types of apps its important to not presume that the
URL will be available. Its good practice to also double check the
formatting of the XML, but that's not what's happening here.
The strange thing is, that with 19 of the 20 testusers, it is working just
fine. But with one user, it keeps on giving this error...
I believe it must be some kind of setting but I kind find out wich one...
It isn't the firewall, he doesn't have a proxyserver set, and the server
works fine, because at the same moment I'm able to connect...
So I'm really stuck...
Run ethereal, select Capture/Start from the menu, select an interface (you
see the drop down on top of the ethereal screen?) (I always choose my
netcard to catch anything) and click ok. That is what I do and here it
works. When I click stop it displays what it caught (if anything, you can
test by browsisng to some page somewhere). Client/server side doesn't
matter.
Any luck?
"Kristof Thys" <Kr**********@l uc.ac.be> wrote in message
news:d1******** **@ikaria.belne t.be... I'm not that familiar with ethereal, but I tried installing it (and
wincap3.1) on my pc... But when I run my program, it doesn't seem to
catpure anything...
I don't have to run it on the server pc do I?
There is always the problem to make a program like this run on someone
elses pc, especially when he's living in Romania...
thx for you help
at wrote: What difference does ethereal show between a successfull and a failed
attempt?
"Kristof Thys" <Kr**********@l uc.ac.be> wrote in message
news:d1******** **@ikaria.belne t.be...
Mezzrow wrote:
Yep.
When writing these types of apps its important to not presume that the
URL will be available. Its good practice to also double check the
formattin g of the XML, but that's not what's happening here.
The strange thing is, that with 19 of the 20 testusers, it is working
just fine. But with one user, it keeps on giving this error...
I believe it must be some kind of setting but I kind find out wich one...
It isn't the firewall, he doesn't have a proxyserver set, and the server
works fine, because at the same moment I'm able to connect...
So I'm really stuck...
at wrote: Run ethereal, select Capture/Start from the menu, select an interface (you
see the drop down on top of the ethereal screen?) (I always choose my
netcard to catch anything) and click ok. That is what I do and here it
works. When I click stop it displays what it caught (if anything, you can
test by browsisng to some page somewhere). Client/server side doesn't
matter.
Any luck?
"Kristof Thys" <Kr**********@l uc.ac.be> wrote in message
news:d1******** **@ikaria.belne t.be...
I'm not that familiar with ethereal, but I tried installing it (and
wincap3.1) on my pc... But when I run my program, it doesn't seem to
catpure anything...
I don't have to run it on the server pc do I?
There is always the problem to make a program like this run on someone
elses pc, especially when he's living in Romania...
thx for you help
at wrote:
What difference does ethereal show between a successfull and a failed
attempt?
"Kristof Thys" <Kr**********@l uc.ac.be> wrote in message
news:d1***** *****@ikaria.be lnet.be...
Mezzrow wrote:
>Yep.
>When writing these types of apps its important to not presume that the
>URL will be available. Its good practice to also double check the
>formatti ng of the XML, but that's not what's happening here.
>
The strange thing is, that with 19 of the 20 testusers, it is working
just fine. But with one user, it keeps on giving this error...
I believe it must be some kind of setting but I kind find out wich one...
It isn't the firewall, he doesn't have a proxyserver set, and the server
works fine, because at the same moment I'm able to connect...
So I'm really stuck...
Ok, on my pc this works fine... I see two relevant things, one GET /URL
HTTP/1.1
and one return: HTTP/1.1 200 OK[Unreassembled Packet] with 50 packets or
so following from the same source and with the same destination saying:
Continuation or non-HTTP traffic...
I will try and do the same with the person where it doesn't work, and
I'll let you know the outcome...
Thanks for your cooperation
Please note that you can save the captured packets (just use the default
format) so you can compare later on.
In the end you should find a difference somewhere between the captured
packets. That should give you a hint on what is wrong.
"Kristof Thys" <Kr**********@l uc.ac.be> wrote in message
news:d1******** **@ikaria.belne t.be... at wrote: Run ethereal, select Capture/Start from the menu, select an interface
(you see the drop down on top of the ethereal screen?) (I always choose
my netcard to catch anything) and click ok. That is what I do and here it
works. When I click stop it displays what it caught (if anything, you can
test by browsisng to some page somewhere). Client/server side doesn't
matter.
Any luck?
"Kristof Thys" <Kr**********@l uc.ac.be> wrote in message
news:d1******** **@ikaria.belne t.be...
I'm not that familiar with ethereal, but I tried installing it (and
wincap3.1) on my pc... But when I run my program, it doesn't seem to
catpure anything...
I don't have to run it on the server pc do I?
There is always the problem to make a program like this run on someone
elses pc, especially when he's living in Romania...
thx for you help
at wrote:
What difference does ethereal show between a successfull and a failed
attempt?
"Kristof Thys" <Kr**********@l uc.ac.be> wrote in message
news:d1**** ******@ikaria.b elnet.be...
>Mezzrow wrote:
>
>
>>Yep.
>>When writing these types of apps its important to not presume that the
>>URL will be available. Its good practice to also double check the
>>formattin g of the XML, but that's not what's happening here.
>>
>
>The strange thing is, that with 19 of the 20 testusers, it is working
>just fine. But with one user, it keeps on giving this error...
>I believe it must be some kind of setting but I kind find out wich
>one...
>It isn't the firewall, he doesn't have a proxyserver set, and the
>server works fine, because at the same moment I'm able to connect...
>
>So I'm really stuck...
Ok, on my pc this works fine... I see two relevant things, one GET /URL
HTTP/1.1
and one return: HTTP/1.1 200 OK[Unreassembled Packet] with 50 packets or
so following from the same source and with the same destination saying:
Continuation or non-HTTP traffic...
I will try and do the same with the person where it doesn't work, and I'll
let you know the outcome...
Thanks for your cooperation This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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