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If you use a local administrator account on the member server, e.g. Administrator
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If you use a local administrator account on the member server, e.g. Administrator

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When you say 'if you use a local administrator account' what exactly do you mean? &nbsp;The default vcenter 5.5 install creates an account called Administrator@vsphere.loca<wbr />l in it's user DB, correct?
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When you say 'if you use a local administrator account' what exactly do you mean?  The default vcenter 5.5 install creates an account called Administrator@vsphere.local in it's user DB, correct?

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Local Administrator account, in the Administrators group on the server.
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Local Administrator account, in the Administrators group on the server.

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Have you gone into the web client and assigned the domain as a valid authentication source and made domain admins part of the Administrator (Vmware) group? If not, you will not be able to login into the VSphere as a domain member.
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Have you gone into the web client and assigned the domain as a valid authentication source and made domain admins part of the Administrator (Vmware) group? If not, you will not be able to login into the VSphere as a domain member.

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I'll try these steps later today.
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Nothing else worked uninstall we tried this.
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Nothing else worked uninstall we tried this.

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I have a vcenter v5.5 install that was originally setup for a non-domain setup... &nbsp;Since then I joined it to the domain and I can't connect my vsphere client to it. &nbsp;The username I'm using is Administrator@vsphere.loca<wbr />l. &nbsp;I assuming it's a permissions or DNS issue. &nbsp;Any ideas of what I need to do?
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I have a vcenter v5.5 install that was originally setup for a non-domain setup...  Since then I joined it to the domain and I can't connect my vsphere client to it.  The username I'm using is Administrator@vsphere.local.  I assuming it's a permissions or DNS issue.  Any ideas of what I need to do?

vcenter v5.5 not working after joining a domain

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.