HTTP GetResponse error on device only

[willisgt]

I've run into a problem - one of my programs sends an HTTP request to a server, which then responds with a text string. The string is a concatenation of several database records, and is often quite long.

One of the program's users - just one - is encountering an error when the program makes the request. Specifically, the error occurs on the line:

Response.Value = Request.GetResponse

The error message is: 'An error occurred on sub_xferdata. An error message cannot be displayed because an optional resource assembly containing it cannot be found.'

This occurs only on the device, not on the desktop (either compiled or running in the IDE).

The device in question is an HTC 8925 / AT&T Tilt. I have copied the program and all associated files to a second HTC 8925, which experienced the same problem.

I'm thinking that there must be something in the string that the server sends back - a null character, or something that doesn't show in the log files (each record sent back to the devices is logged on the server).

Has anyone encountered anything like this with the HTTP library?


Gary

[Erel]

If you can please install this optional resource: error messages on device
It will now show a more descriptive error message.

[willisgt]

The error message now reads "Could not establish connection to network".

I can certify to you that the program (running on the device) is sending its request to the server, because the server logs the request. The request is correctly formed and contains no errors.

So how could it be that the device can't connect to the network?


Gary

[Erel]

Did you try to send this request with the Pocket Internet Explorer?
Maybe there is a proxy settings missing?

[willisgt]

I have not tried to send the request with pocket explorer, as the request is rather lengthy.

What I absolutely do not understand is why only one of the devices is having this problem. All of the others - and there are quite a few - are working perfectly.

The response from the server is dependent on (1) the company the user works for, as this selects the database; (2) the id of the user, as this pulls records specific to that user; and (3) the date, as the server only returns records which are both unexpired and relevant for the next week or so (user selectable from 1 to 30 days).

If I configure another, identical device to the same company and user id, it works properly. The problem (I'm almost 100% sure) lies in the fact that the program requests updates for records it already has in the local (on the device) database. Since those records don't exist on the second device (working properly), it doesn't request updates for them, and the server doesn't return them.

I'll try entering the query into pocket explorer.


Gary