IE10 gets Http 401 error while trying to access asmx service jsdebug file

Question

We have an ASP.NET application that works without any problem in previous version of Internet Explorer 10.

But the same application does not work in Internet Explorer 10.

When I investigated the issue, I found out the references of .asmx web services gets 401-unauthorized error.

The only difference between an problematic request of IE10 and working request of IE9 is : User-Agent string.

Let me show you the difference:

Below request is the problematic request of IE10.

---

GET http://abc.com/Services/ResourceService.asmx/jsdebug HTTP/1.1
Accept: application/javascript, */*;q=0.8
Referer: http://abc.com/def/ghi.aspx
Accept-Language: tr-TR
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)
Connection: Keep-Alive
DNT: 1
Host: sgmiis2:8090
Cookie: .ASPXANONYMOUS=XXXASP.NET_SessionId=YYY;ASPXAUTH=ZZZ;

---

It is getting

401 - Unauthorized: Access is denied due to invalid credentials.

---

Here is the same application's request via before IE10 .

GET http://abc.com/Services/ResourceService.asmx/jsdebug HTTP/1.1
Accept: application/javascript, */*;q=0.8
Referer: http://abc.com/def/ghi.aspx
Accept-Language: tr-TR
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/6.0;)
Connection: Keep-Alive
DNT: 1
Host: sgmiis2:8090
Cookie: .ASPXANONYMOUS=XXXASP.NET_SessionId=YYY;ASPXAUTH=ZZZ;

But this request is working and getting

HTTP/1.1 200 OK

---

As you can see the only difference is "MSIE 10.0" and "MSIE 7.0/MSIE 8.0/MSIE 9.0" sections of user-agent header.

I am creating the request via Fiddler's Composer section. So there is no risk of really getting 401 error. (with faulty cookies I mean) Because when I changed the user-agent string only, I can successfully get the response of HTTP 200.

Any idea how can I figure out the issue?

Thanks,

Fatih.

Answer 1

There are so many issues with ie 10.

A hotfix is available for the ASP.NET browser definition files in the Microsoft .NET

please refer http://support.microsoft.com/kb/2600088 for .NET 4.0 Refer http://support.microsoft.com/kb/2608565 for .Net 3.5

Please also check this :-http://connect.microsoft.com/VisualStudio/feedback/details/662275/asp-net-user-agent-sniffing-and-ie10-internet-explorer-10

I hope it will help you.