HTTPRequest Freezes For 5 Minutes Intermittently And Throws "Unknown name" Javascript Exception

[oopaevah]

I am using the Microsoft.XMLHT TP object to make server requests ie;
ajax. This is working 99% of the time but occasionally it will freeze
at the server for 5 minutes and then raise a javascript exception
"Unknown name".

After the exception I can run the same request ok, and keep doing so
until the next time it freezes for 5 minutes.

What does the "Unknown name" javascript exception mean?

Why does it freeze for 5 minutes?

I can't replicate this on my dev pc, it's only happening in a live
environment with IE6 and 2 load balanced IIS6 servers.

[David Golightly]

oo******@yahoo. co.uk wrote:

I am using the Microsoft.XMLHT TP object to make server requests ie;
ajax. This is working 99% of the time but occasionally it will freeze
at the server for 5 minutes and then raise a javascript exception
"Unknown name".

After the exception I can run the same request ok, and keep doing so
until the next time it freezes for 5 minutes.

What does the "Unknown name" javascript exception mean?

Why does it freeze for 5 minutes?

I can't replicate this on my dev pc, it's only happening in a live
environment with IE6 and 2 load balanced IIS6 servers.

Are you using "synchronou s" or "asynchrono us" XMLHttp? Turn on the
Asynchronous option and your script won't hang. Otherwise, this is not
a JavaScript issue but an HTTP issue and the problem lies between your
server and your connection. I take it you have some sort of session
timeout and the connection keeps getting reset. Without seeing any of
your code to know what's going on here, I'd take a stab at it and say
"Unknown name" is probably an HTTP error that you're running into when
the request times out.

[oopaevah]

Are you using "synchronou s" or "asynchrono us" XMLHttp? Turn on the
Asynchronous option and your script won't hang. Otherwise, this is not
a JavaScript issue but an HTTP issue and the problem lies between your
server and your connection. I take it you have some sort of session
timeout and the connection keeps getting reset. Without seeing any of
your code to know what's going on here, I'd take a stab at it and say
"Unknown name" is probably an HTTP error that you're running into when
the request times out.

I'm using a synchronous http request, I've attached my function below.
I can't use asynchronous because the flow needs to be strictly
controlled due to the nature of the application. The catch() block is
triggered after the 5 minute freeze. The http request completes
successfully after 5 minutes.

This problem hasn't occured since iisreset was run last night. If this
problem comes back I will update this thread.

Thanks

CallServer : function( sAction, sSendMethod)
{
var sReturn = "";
var oEngine;// = this.Request.En gine;
var sParameterStrin g = "";
var sPostString = null;

try
{
oEngine = new ActiveXObject(" Microsoft.XMLHT TP");//ELMS TEST
if( oEngine != null)
{
if( oEngine.readySt ate == 4 || oEngine.readySt ate == 0)
{
var sUrl = "ServerInteract .aspx?token=" + Page.Token + "&dothis=" +
sAction;

if( arguments != null)
{
for( nParameterIndex = 2; nParameterIndex < arguments.lengt h;
nParameterIndex ++)
{
sParameterStrin g += arguments[nParameterIndex];
if( nParameterIndex < arguments.lengt h - 1)
{
sParameterStrin g += "&";
}
}
}

if( sSendMethod.toL owerCase() == "post")
{
sPostString = sParameterStrin g;
}
else
{
sUrl += "&" + sParameterStrin g;
}

sUrl += "&millis=" + new Date().getTime( );

oEngine.open( sSendMethod, sUrl, false);
oEngine.setRequ estHeader( 'Content-Type',
'application/x-www-form-urlencoded');

System.Log( "ServerInteract .CallServer() : Sending '" + sPostString
+ "' with action '" + sAction + "' to " + sUrl);

oEngine.send( sPostString);

sReturn = oEngine.Respons eText;

System.Log( "ServerInteract .CallServer() : Done : \r\n" + sReturn);

if( sReturn.indexOf ( "exception: ") == 0)
{
PageRendering.H andleError( sReturn);
sReturn = "";
}
}
else
{
System.Log( "ServerInteract .CallServer() : Cannot Send() because
oEngine.readySt ate = " = oEngine.readySt ate);
}
}
else
{
System.Log( "ServerInteract .CallServer() : Cannot Send() because
oEngine is null");
sReturn = "";
PageRendering.H andleError( "XmlHttpReq uest Fail 1");
}
}
catch( e)
{
sReturn = "";
System.Log( "ServerInteract .CallServer() : Cannot Send() because of
exception '" + e.message + "");
PageRendering.H andleError( "XmlHttpReq uest Fail 2: " + e.message);
}

return sReturn;
},