The Community Forums

Interact with an entire community of cPanel & WHM users!
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

What will happen if I close UDP_OUT port 123, the NTP port?

Discussion in 'General Discussion' started by jols, Dec 7, 2011.

  1. jols

    jols Well-Known Member

    Joined:
    Mar 13, 2004
    Messages:
    1,111
    Likes Received:
    2
    Trophy Points:
    38
    This may be a dumb question but - I may need to close this port for a while, i.e. UDP_OUT port 123, if I did, will whm/cpanel still be able to sync with an external time server?

    As an adjunct, does anyone know how to update the NTP system on the server?
     
  2. cPanelMichael

    cPanelMichael Forums Analyst
    Staff Member

    Joined:
    Apr 11, 2011
    Messages:
    30,666
    Likes Received:
    646
    Trophy Points:
    113
    cPanel Access Level:
    Root Administrator
    Hello :)

    Closing port 123 would prevent time synchronization via the "ntpdate" command. However, you could use "rdate" to synchronize the server time instead. For example:

    Code:
    # rdate -s rdate.cpanel.net
    "rdate" requires TCP outbound traffic over port 37.

    Thank you.
     
Loading...

Share This Page