CODEWITHSUNDEEP
windows-servicesipc
Danno
Danno

Reputation: 1003

IPC Remoting problem

We are receiving the following error using IPC.
"Failed to connect to an IPC Port: The system cannot find the file specified." The issue is happening on a Windows 2003 server.

Of course it only happens in production. We are unable to reproduce this in our development environment.

The Windows service that is attempting to use IPC is running as Local System.

Is there some sort of permission that needs to be changed?

Upvotes: 2

Views: 11460

Answers (4)

Confused Vorlon
Confused Vorlon

Reputation: 10446

We had this problem in production code. It was failing on a small percentage of user's systems.

The error turns out to be in the microsoft code that we were using. It generates the IPC channel using the username.

ipc://APP_USER_000:SingeInstanceIPCChannel/SingleInstanceApplicationService

with certain characters in the username, this generates an invalid channel URL, so the receiving app fails to create the channel in the first place.

our fix is to use a hash of the username, rather than the first characters in the username.

(we were using the code here: http://blogs.microsoft.co.il/blogs/arik/archive/2010/05/28/wpf-single-instance-application.aspx )

Upvotes: 1

Adil Malik
Adil Malik

Reputation: 6357

For me DTA was working fine. But Suddenly I started getting this same error.

For me the fix was this:

-> Go To Task Manager
-> Go To Processes Tab
-> Find and kill the DTA process. For me this process is named as 'DTASHELL.exe'

Now try to launch DTA. It should work now :-)

Upvotes: 1

Danno
Danno

Reputation: 1003

We were attempting to access the channel before it was spun up. So we would receive the 'not found' error. Wrapping the access code in some 'is it really ready' code fixed the problem.

Upvotes: 1

Yoni Shalom
Yoni Shalom

Reputation: 499

Please post the code you use to initialize the server channel and publish the object, and the client code with the uri you use when you try to access the remote object.

A common pitfall is when you initialize the channel with a dictionary, and set the name of the channel using 

dic["name"] = "channelName";  
//used for retrieving the channel - ChannelServices.GetChannel("channelName");

instead of 

dic["portName"] = "channelName";
//used as the identifier for the named pipe - 
//The client should get the object from the uri : ipc://channelName/objectName

Upvotes: 0

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