Unable to login vCenter 5.1 using vSphere Client

Unable to login to vCenter 5.1 with vSphere Client by explicitly putting user name and password. It is giving the following error-

"cannot complete login due to an incorrect user name and password"

Whereas, login is successful if we use the checkbox in the vSphere Client "use Windows session credentials".

Please help to recover this error.
cbinayakAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Are you connecting direct to ESXi Host or vCenter Server ?

Whereas, login is successful if we use the checkbox in the vSphere Client "use Windows session credentials".

this suggest vCenter Server, unless you have populated your ESXi host with non root accounts.
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cbinayakAuthor Commented:
I've logged in to the vCenter Server and then trying to connect to the vCetner Console via vSphere Web Client.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Do you have more than a single domain on your network or trust ?

so is the issue with Web Client and vSphere Client ?
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cbinayakAuthor Commented:
We have single domain. I am not sure whether there is an issue with Web Client or vSphere Client as I am able to login by using the checkbox in the vSphere Client "use Windows session credentials".
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Okay, if you can login with use Windows session credentials, it depends what use Windows session credentials these are?

so what are they ?
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cbinayakAuthor Commented:
It was the problem with the SSO Server. Logged a case with VMware and they have suggested to reinstall the SSO Server.
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