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Error Message: "Port in Use" or "Port Already Open"

This article was previously published under Q168222
Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.
When you attempt to start a communications program, you may receive one ofthe following error messages:
Error: port in use

OpenComm: Port already open
This behavior can occur if Rnaapp.exe is active in memory.
To work around this issue, follow these steps:
  1. Press CTRL+ALT+DELETE to open the Close Program dialog box.
  2. Click Rnaapp to select it, and then click End Task.
  3. Start your communications program.
When you finish using a communications program and close the connection,Rnaapp.exe is still running and the port remains unavailable to non-TAPIprograms.

Rnaapp.exe is left in memory to allow TAPI programs to open faster.Rnaapp.exe is eventually unloaded from memory (unless Dial-Up NetworkingServer is set to allow caller access), but it may take 10-15 minutes.

Article ID: 168222 - Last Review: 11/15/2006 16:35:55 - Revision: 1.1

  • Microsoft Windows 95
  • kbdialup kberrmsg KB168222