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System.Net.WebClient - 11/13/2006 4:47:21 AM

ziminski

Posts: 79
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Joined: 1/8/2006
Status: offline

Does anybody know what this error is and how to get around it?

Exception calling "DownloadString" with "1" argument(s): "The server committed a protocol violation. Section=ResponseStatusLine"
At line:1 char:57

I'm calling:

$page = (new-object System.Net.WebClient).DownloadString("http://xxx.xxx.xxx.xxx:9999")
$page

I am trying to check the responce from a time clock(s) which runs a stripped down version of linux and Apache. It uses a web interface for configuration, so I figured I can check it to see when it's on line and the service is up. (I also check it via ping and telnet service) but they could be running and the application hung.

Thanks
Rick

Post #: 1

RE: System.Net.WebClient - 11/14/2006 12:40:36 AM

SAPIENScripter

Posts: 276
Score: 2
Joined: 11/1/2006
From: SAPIEN Technologies
Status: offline

The command works fine if you use a host name instead of the IP address.

$page=(new-object system.net.webclient).DownloadString("http://www.jdhitsolutions.com:80")

I'm assuming the WebClient object is expecting a name and not an IP address.

_____________________________

Jeffery Hicks
Windows PowerShell MVP
SAPIEN Technologies - Scripting, Simplified. www.SAPIEN.com

Follow Me: http://www.twitter.com/JeffHicks

(in reply to ziminski)

Post #: 2

RE: System.Net.WebClient - 11/14/2006 2:54:59 AM

ziminski

Posts: 79
Score: 2
Joined: 1/8/2006
Status: offline

Unfortunately using host name produces the same error. How ever the error it's self tells me the web serviceis up. If it is not up I get an unkown host error. So a little klugee but I parse the return for the result I want like so.
$page = $web.DownloadString("http://" + $objRecordset.Fields.Item("terminalipaddress").Value + ":9999" -f $_ ) | match-string -eq "Unable to connect to the remote server"
if ($lastexitcode -eq 0){$ws.Cells.Item($r, 5) = "YES"} else { $ws.Cells.Item($r, 5) = "NO"}

It seems to work.

Rick

(in reply to SAPIENScripter)

Post #: 3

RE: System.Net.WebClient - 11/14/2006 4:10:14 AM

SAPIENScripter

Posts: 276
Score: 2
Joined: 11/1/2006
From: SAPIEN Technologies
Status: offline

That is very odd. The only time I get your problem is if I use an IP address. Do you get the same result regardless of what hostname you use? If you used
$page=(new-object system.net.webclient).DownloadString("http://www.jdhitsolutions.com:80")
do you get the same error? I'm curious if this is a PowerShell/.NET issue or something specific to the server you are trying to connect to.

Are you running PowerShell RC2?

_____________________________

Jeffery Hicks
Windows PowerShell MVP
SAPIEN Technologies - Scripting, Simplified. www.SAPIEN.com

Follow Me: http://www.twitter.com/JeffHicks

(in reply to ziminski)

Post #: 4

RE: System.Net.WebClient - 11/14/2006 7:33:43 AM

ziminski

Posts: 79
Score: 2
Joined: 1/8/2006
Status: offline

If I connect to a known windows server inside my firewall by host name no problems.
when I connect to
PS C:\Powershell> $page=(new-object system.net.webclient).DownloadString("http://www.jdhitsolutions.com:80")
Exception calling "DownloadString" with "1" argument(s): "The underlying connection was closed: An unexpected error occurred on a receive."
At line:1 char:55
+ $page=(new-object system.net.webclient).DownloadString( <<<< "http://www.jdhitsolutions.com:80")
But this might be a firewall issue. I think the other error maybe specfic to the servers I'm trying to connect to.A stripped down version of linux and Apache
and yes PowerShell RC2

< Message edited by ziminski -- 11/14/2006 7:34:53 AM >

(in reply to SAPIENScripter)

Post #: 5

RE: System.Net.WebClient - 11/14/2006 7:53:57 AM

SAPIENScripter

Posts: 276
Score: 2
Joined: 11/1/2006
From: SAPIEN Technologies
Status: offline

It makes sense that if you have a firewall or proxy this will cause a problem. I don't know without some research how this class gets around or uses a proxy.

_____________________________

Jeffery Hicks
Windows PowerShell MVP
SAPIEN Technologies - Scripting, Simplified. www.SAPIEN.com

Follow Me: http://www.twitter.com/JeffHicks

(in reply to ziminski)

Post #: 6

RE: System.Net.WebClient - 11/28/2006 8:13:28 AM

ziminski

Posts: 79
Score: 2
Joined: 1/8/2006
Status: offline

Found to make this work I needed to add the proxy server and UseDefaultCredentials

$webclient= new-object System.Net.WebClient
$proxy = new-object System.Net.WebProxy "proxy.server.com:8080"
$proxy.UseDefaultCredentials = $true
$webclient.proxy=$proxy
$webclient.DownloadString($url)

not sure why it would matter for an ip address inside my fire wall but it did.

hope it is usefull to someone else.
Rick

(in reply to SAPIENScripter)