We have already discussed the importance of having the network time synchronized. If vCenter Server is connected to an external PSC and the time is not synchronized, you may experience authentication issues. To avoid this problem, make sure you configure the same time synchronization source.

To configure time synchronization, follow these steps:

1. From the VAMI, go to the Time tab to configure the time zone and time synchronization.
2. In the Time zone area, click the Edit button to configure the correct time zone.
3. In the Time Synchronization area, click the Edit button and set the Mode field as NTP, then specify the NTP source servers.
4. Click OK to save the setup.