My computer is connected to a domain, but when I go to create a public queue:
MessageQueue.Create(@".\testqueue");
I get this error:
A workgroup installation computer does not support the operation.
Why might MSMQ think I'm on a workgroup computer?
I know this is late, and there is already an accepted answer, but I just had this issue and it was resolved by changing the format of the queue string.
When my queue name was this, I got the workgroup error:
".\QueueName"
When I changed it to a more formal version, there was no error and sending to the queue worked:
"FormatName:DIRECT=OS:ComputerName\private$\QueueName"
Just in case someone else comes across this post, now they have something else to try...