IP-based AUTD has detected that the registry value for the UDP listen port falls outside the allowed range of 1 to 65535, inclusive. As a result, we will proceed with the default UDP listen port of []. To avoid seeing this message in the future, please correct this registry value, or omit it entirely in order to use the default.

Details
Product: Exchange
Event ID: 3021
Source: Server ActiveSync
Version: 6.5.7638.0
Component: Microsoft Exchange ActiveSync
Message: IP-based AUTD has detected that the registry value for the UDP listen port falls outside the allowed range of 1 to 65535, inclusive. As a result, we will proceed with the default UDP listen port of [<number>]. To avoid seeing this message in the future, please correct this registry value, or omit it entirely in order to use the default.
   
Explanation

Exchange ActiveSync detected that the registry value for the User Datagram Protocol (UDP) listen port is not in the allowable range. The default value for this setting is port 2883. You can specify a value between 1 and 65535.

   
User Action

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.

To edit the registry to resolve this error:

  1. On the computer running Exchange Server, start Regedit.exe.
  2. Open the following registry key:

    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MasSync\Parameters

    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” (http://go.microsoft.com/fwlink/?linkid=3052&kbid=256986).

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