123 UDP protokolü hakkında...

Merhabalar;

Arkadaşlar Watchguard XTM22 series bir cihazımız var. sormak istediğim şudur.

123 UDP protokolü nedir?

Bu portu açmak mı gerekir? DC üzerinde aşağıdaki Windows-Kerberos-Key-Distribution-Center hatasını alıyorum ve bunun 123 portundan kaynaklandığını düşünüyorum.

Log Name: System
Source: Microsoft-Windows-Kerberos-Key-Distribution-Center
Date: 12.11.2012 15:18:57
Event ID: 29
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer: cozumpark.local
Description:
The Key Distribution Center (KDC) cannot find a suitable certificate to use for smart card logons, or the KDC certificate could not be verified. Smart card logon may not function correctly if this problem is not resolved. To correct this problem, either verify the existing KDC certificate using certutil.exe or enroll for a new KDC certificate.
Event Xml:
<Event xmlns=" http://schemas.microsoft.com/win/2004/08/events/event ">
<System>
<Provider Name="Microsoft-Windows-Kerberos-Key-Distribution-Center" Guid="{3FD9DA1A-5A54-46C5-9A26-9BD7C0685056}" EventSourceName="KDC" />
<EventID Qualifiers="32768">29</EventID>
<Version>0</Version>
<Level>3</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2012-11-12T13:18:57.000000000Z" />
<EventRecordID>3708</EventRecordID>
<Correlation />
<Execution ProcessID="0" ThreadID="0" />
<Channel>System</Channel>
<Computer>COZUM.cozumpark.local</Computer>
<Security />
</System>
<EventData>
</EventData>
</Event>