Exchange 2013 - reset virtual directories - ecp login failure

Hi All

For some reason I've changed authentication settings for some virtual directories directly in IIS (enabling / disabling "Basic Authentication", "Windows Authentication"...) I know, I've made mistake!
 Now I'm unable to login to https://exchangeurl/ecp. Although I'm certain that I've entered accurate username/password, I'm constantly getting the same login page with message that entered credentials are not ok. I have tried below but still no luck,

Remove-EcpVirtualDirectory -Identity "Exchange01\ecp (Default Web Site)"

New-EcpVirtualDirectory -WebSiteName "Default Web Site" -InternalUrl "https://server1.example.com/ecp

when i login to admin center, below window pop up
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after i typed in login id and password, it shows below
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piaakitAsked:
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basil2912Commented:
Hello,

Looks like the error is 400.

Might wanna check http://pcsupport.about.com/od/findbyerrormessage/a/400error.htm for instance.

Have a look through IIS and check for any redirection.

Compare settings to OWA vdir (I assume it works).

Proxy server?

Run an IISreset (although I assume you've done it already).

In Exchange 2013 the settings are to be done on Exchange level (if you change them in IIS they will be rewritten.
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piaakitAuthor Commented:
Any more step can provide ? Still doesn't work
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piaakitAuthor Commented:
I have tried to remove back end ecp and created back in IIS back end ecp by adding application , after that I can not login ecp by using correct administrat password , any idea ?
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basil2912Commented:
Did you check for any redirection In IIS for ECP?

IIS redir ECP IIS redir ECP (2)
Make sure the checkbox for redirect is not there, like in the screenshot.
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piaakitAuthor Commented:
Checked http redirect is no enabled
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advantagecCommented:
I am having the same issue here..... what a trash program... I went through all directories and still no luck....
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