By default, vCenter Server changes the vpxuser password automatically every 30 days. You can change that value from the vSphere Client.
- Log in to the vCenter Server system by using the vSphere Client.
- Select the vCenter Server system in the object hierarchy.
- Click Configure.
- Click Advanced Settings and click Edit Settings.
- Click the Filter icon and enter VimPasswordExpirationInDays.
- Set VirtualCenter.VimPasswordExpirationInDays to comply with your requirements.