You have various options to solve problems related to Simple Network Time Protocol (SNTP). Here are some common problems that your system might encounter when you adjust time using SNTP.
The following list identifies problems you might encounter and provides a way to recover:
If you are using the SNTP client through a firewall, the firewall configuration might need to be updated to allow the passing of User Datagram Protocol (UDP) packets on port 123.
If you have selected Server must be synchronized before valid time is served on the Server page of SNTP properties, have the system configured as an SNTP client connected to an active time server before the server can respond to client polls.
If SNTP is not making correct time adjustments or if you want to start a new time adjustment, you need to ensure that SNTP is stopped properly.
Logging SNTP activity can help you identify problems with the server or client.
Related concepts
Troubleshooting time management Troubleshooting Service and support