By default, vCenter Server changes the vpxuser password automatically every 30 days. You can change that value from the vSphere Web Client.
Procedure
- Select the vCenter Server in the vSphere Web Client object hierarchy.
- Click Configure.
- Click Advanced Settings and enter VimPasswordExpirationInDays in the filter box.
- Set VirtualCenter.VimPasswordExpirationInDays to comply with your requirements.