If you're talking about the vSphere ESXi, the default local user is root, but there is no default password, during the installation a password must be defined. Old vSphere ESXi versions can be installed without the root password, but to connected through the vSphere Client, the root password must be defined after the installation.---
Senior Infrastructure Specialist
2 people found this helpful
As mentioned the default user account is root, if you have forgotten the password use this process
Which product are you talking about?
For ESXi see the other user's relies. For other products - depending on how they were installed - you may try vmware, or changeme as the password.
The KB article attached by @battybishop explains it all.
The new versions of ESXi(4.x, 5.x, 6.x) they do not support resetting password in case you have forgotten, in which case you will have to reinstall the ESXi host (this is the only supported way).
In case if this was a scripted installation / Auto deploy based installation, you should check your script / host profile on vCenter Server to find out the password.
Hope it helps.
There is a way to reset ESXi Root Password of WSXi host using VMware Host Profile
There are two Pre-requisites to reset ESXi root password using VMware Host Profile
1. The ESXi host is reachable via the network and managed through the vCenter Server
2. ESXi host configured with vSphere Enterprise Plus license.