Event ID:3015
Source:Server ActiveSync
Component:Microsoft Exchange ActiveSync
Message:IP-based AUTD failed to initialize because the processing of notifications could not be setup. Error code [0x<number>]. Verify that no other applications are currently bound to UDP port [<number>], or try specifying a different port number.

This event indicates that more than one application is attempting to use the User Datagram Protocol (UDP) listen port.

User Action

To resolve this error, do one or more of the following:

Important  This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Regedit.exe or Regedt32.exe.

  • Verify that no other applications are currently bound to the UDP listen port on the computer. If any other applications are using the UDP listen port, specify a different UDP port. For information about how you can determine the applications using the UDP listen port specified in the event description, see Microsoft Knowledge Base article 323352 "How To Determine Which Program Uses or Blocks Specific Transmission Control Protocol Ports in Windows Server 2003" (
  • Edit the registry and specify a different UDP port number to resolve this error:
    1. On the computer running Exchange Server, start Regedit.exe.
    2. Open the following registry key:


      The registry value name for the UDP listen port is UdpListenPort.

    3. Do one of the following:

      • To return to the default configuration of port 2883, delete the parameter UdpListenPort.
      • To specify a different value for the UDP listen port, right-click UdpListenPort, and then click Modify. In Edit DWORD Value, in Value data, type a value between 1 and 65535.

    4. Close Registry Editor.
    5. Restart Internet Information Services (IIS).

    Before you edit the registry, and for information about how to edit the registry, see Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows Registry" (

Currently there are no Microsoft Knowledge Base articles available for this specific error or event message. For information about other support options you can use to find answers online, see