VMware offers many appliances for their products. Unfortunately they are not all created equally. The installation and configuration procedures differ for most appliances and also the default usernames and passwords are different throughout the range of appliances. So here is a list of default usernames and passwords. For as far as I know them, if you miss one please let me know and I will add it to this list.
|Appliance name (all versions unless specified differently)||user||password|
|vCenter Server Appliance||root||vmware|
|vSphere Data Protection||root||changeme|
|vSphere Management Assistant||vi-admin||vmware|
|vCenter Operations Manager Appliance administrative user for UI-login||admin||admin|
|vCenter Operations Manager Appliance root user||root||vmware|
|vCloud Director 5.5||root / guest||<*>|
|vCloud Connector (server and node)||admin||vmware|
|Horizon Workspace||root / admin||<*>|
|vCenter Orchestrator Appliance Configuration||vmware||<*>|
<*> for some appliances you configure the password during the OVA or OVF deployment.