Article ID: 898856 - View products that this article applies to.
When you use Microsoft Office Communicator 2005 to share a program on your computer, you may notice that you cannot share the program. Additionally, you may also receive one of the following error messages when you invite participants to share your program or when a participant invites you to share their program:
Inviter side error: Cannot establish the data sharing session with username because the data sharing program is not configured or installed correctly.
Receiver side error: Cannot establish the data sharing session with username because the data sharing program is not configured or installed correctly.
This issue may occur if a program that runs on your computer is using port 1503. Communicator 2005 uses port 1503 to establish a connection. If this port is already being used by another program, Communicator 2005 cannot use this port to establish a connection. Therefore, you cannot send a request to invite participants to share your program. Similarly, you cannot receive any requests from participants who want to share their program.
To resolve this issue, identify the program that uses port 1503, and then close the program session to release port 1503. To do this, follow these steps: