.Net Web Services consume DCOM problem!!! big problem!!!

the senario is like that:

PC1 got a Com+ application
PC2 is Web Service that host the .net web services
I export the Com+ application proxy and install into the PC2.
I add reference in the Web services project then
I code:
<WebMethod()> Public Function GetCustomerWS() As String
Dim objFDIP As New FDIPCOM.FDIPCOMServices()
Dim strReturn As String
Return strReturn
End Function
when I run the Web Services, and invoke it, it return nothing but:
HTTP 500 Internal server error.
The same code used in VB.NET Windows Form application is working just fine, the dcom actually return back the string i want correctly.
Can any tell me what happen to my web services???
7/3/2003 3:26:46 AM
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Some thing to add that, if the COM+ application is on the local computer, the web services is actually working fine, but if is on another PC, the problem occur.
7/3/2003 3:36:07 AM
is it by question to long for you to understand?
7/3/2003 6:32:38 AM
no one face this problem b4?
7/4/2003 2:18:12 AM

Is COM+ Application is Library application or Server Application ?


7/4/2003 5:23:03 AM
OH, finally i see some light, it is Server Application.

I suspect is security reason. but don know what to do.
7/4/2003 6:37:10 AM
why no one answer my question one.
7/4/2003 8:15:45 AM
Try changing <webmethod()> to just <webmethod>
.NET newbie

WebApps best used if you come to my office and look at it on my monitor
7/7/2003 8:57:30 PM
Try changing <webmethod()> to just <webmethod>

I'm pretty sure that won't work. joonping, are there any entries in the Windows event log on the Web server machine? There should be for an HTTP 500 error.
Don Kiely, MCP, MCSD
In the Last Frontier, Interior Alaska
Please post questions and replies to the forum! And remember to MARK AS ANSWER when someone definitively answers a question or resolves a problem!
7/7/2003 9:02:23 PM
oh, hi.

I can't see any HTTP 500 error in the event log. so what can I do then.
Thanks for you time...
Joon PIng
7/8/2003 1:32:20 AM
Hi Joon,

Well, it won't actually say HTTP 500; I didn't mean to imply that. But it should be some kind of IIS log event. Are there any?
If there isn't, you may have an unhandled exception in the app that you've also configured ASP.NET to ignore. That'll be the next avenue to explore in trying to figure out what's going on.
Don Kiely, MCP, MCSD
In the Last Frontier, Interior Alaska
Please post questions and replies to the forum! And remember to MARK AS ANSWER when someone definitively answers a question or resolves a problem!
7/9/2003 12:04:18 AM
if there is an internal server error ,what should i do?
11/20/2004 4:34:20 AM
The best set of clues will be in the Windows event logs. Have you looked at those?

Don Kiely, MCP, MCSD
In the Last Frontier, Interior Alaska
Please post questions and replies to the forum! And remember to MARK AS ANSWER when someone definitively answers a question or resolves a problem!
11/23/2004 8:07:35 AM

I have the same problem. Anyone been able to resolve this issue?

Working under Visual Studio 2005 B1,  calling to a DCOM object using COM Interopt works fine with my NT credentials. However, initiating through IIS, it seems to be an authentification issue (Internet Client Error). I tried impersonation and that did not work.

I see nothing in any event logs.

I remember having to once alter the machine.config under 1.1 framework by changing userName from 'Machine' to 'System' in the <processModel> section for another issue in another project. It seems that the <processModel> is no longer there in 2.0 Beta1. I think I read I can add it in and restart IIS (I'm on IIS 6). Would this help?



4/29/2005 12:46:51 PM

I found the answer that will work for my implementation, but it may not be the best solution or your solution.

I am running Whidbey Beta1 on Win2K3 (IIS 6).

In my scenario, the COM objects use RDS (HTTPS) to communicate to the DCOM server and I was getting -2147012851: Internet Client Error. (0x80072f0d). The Hex error coded is related to Certificate Authentification. By calling the DCOM Server using HTTP, I was authenticating without a problem. 

After some more research I found out that when you normally navigate to a secure page using a browser the first time, you can get a Security Alert pop-up. However, a request coming from IIS on another server cannot display this interface so it always assumes NO and returns Internet Client Error.

The credentials being passed were IWAM_ServerName to the DCOM server when the RDS object called the DCOM Server via HTTPS. I immediate tried Impersonation which did not work either. I was about to give up when I stumbled upon another way to impersonate.

My resolution: Using Application Pools in IIS 6, you can run as different credentials (among other uses!). This is similar to impersonation under IIS 5, however I was not successful with impersonation with Whidbey in this particular situation. My NT credentials were valid to the DCOM server so I needed to do the following to get my credentials into action:

1. Create an Application Pool (refer to Help in IIS). Be sure to change the identity tab. In this case I'm using my NT Account.

2. Add my NT account to the IIS_WPG Group

3. Open IIS and open properties to the Web Service (or Web Site)

4. Under the Directory/Home Directory Tab change the Application Pool dropdown and select the application pool you created.

The only thing left is to test scalability with a multithreaded process (asp.net) calling Single threaded apartment (STA) objects (COM). I've only found one article on this and it states to create threads in your web service to instantiate my COM objects. If anyone could point me in a more accurate direction, I would appreciate it.

5/12/2005 1:41:29 PM

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