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Known issue with system variable paths try this kb fix.<br />
<br />
<a href="http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2000321" rel="ugc nofollow">http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2000321</a>
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Known issue with system variable paths try this kb fix.

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2000321 [http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2000321]

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Do you have SSO enabled? Try the username without the domain.<br />
<br />
Example - admin instead of admin@domain.com or domain/admin
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Do you have SSO enabled? Try the username without the domain.

Example - admin instead of admin@domain.com or domain/admin

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SSO installed - have tried that <br />
<br />
This is a fresh install. I can logon onto web client with domain credentials.
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SSO installed - have tried that

This is a fresh install. I can logon onto web client with domain credentials.

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Have created DSM and already have the database .... so I dont think I have missed anything.
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Have created DSM and already have the database .... so I dont think I have missed anything.

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OK just put in my domain admins account and it worked. Yet my vcenter service account which is an administrator of the server doesn't work?
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OK just put in my domain admins account and it worked. Yet my vcenter service account which is an administrator of the server doesn't work?

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I run the install wizard for update manager and the page that takes your server ip, port #, username, password, etc won't accept my credentials. &nbsp;A popup says &quot;Setup failed with an unknown error. &nbsp;vCenter Server credentials could not be validated. &nbsp;I'm using the admin@System-Domain user and it works just fine getting into the vSphere client. &nbsp;Ive also tried using domain accounts but no joy. <br />
<br />
Anyone had same error?
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I run the install wizard for update manager and the page that takes your server ip, port #, username, password, etc won't accept my credentials.  A popup says "Setup failed with an unknown error.  vCenter Server credentials could not be validated.  I'm using the admin@System-Domain user and it works just fine getting into the vSphere client.  Ive also tried using domain accounts but no joy. 

Anyone had same error?

Vcenter 5.1 installing VUM

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.