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

[jols]

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?

 

[cPanelMichael]

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:

# rdate -s rdate.cpanel.net

"rdate" requires TCP outbound traffic over port 37.

Thank you.