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Are you logging in as the domain administrator or the local Windows administrator?
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I see administrators are members of domain and enterprise admins
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when I use the same credentials on my cas server, it works fine
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hi, <br />
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I think it is necessary to check the network connectivity between the server and your domain controller
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we are having exchange resource forest and our cas server is also dc in same ad forest and in same location, we are having proper network connectivity
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Maybe someone set the same password for the local and domain administrator account so it appears you are logging in as the same administrator user when in actuality you are not. &nbsp;The error you provided specifically states 'servername\administrator'<wbr /> which is the local administrator account.
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Glad I could help. &nbsp;Take care :)
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when I am using administrator credentials to log into my mailbox server, I am getting ERROR: active directory failed on server servername\administrator on bind operation is invalid, error coe 0x31, it was running command get-receipient resultsize 1000 -sortby &quot;display name - receipient type &quot;user mailbox&quot; <br />
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and I don't see any mailbox in EMC
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when I am using administrator credentials to log into my mailbox server, I am getting ERROR: active directory failed on server servername\administrator on bind operation is invalid, error coe 0x31, it was running command get-receipient resultsize 1000 -sortby "display name - receipient type "user mailbox" 

and I don't see any mailbox in EMC

Are you logging in as the domain administrator or the local Windows administrator?

I see administrators are members of domain and enterprise admins

when I use the same credentials on my cas server, it works fine

hi, 

I think it is necessary to check the network connectivity between the server and your domain controller

we are having exchange resource forest and our cas server is also dc in same ad forest and in same location, we are having proper network connectivity

Maybe someone set the same password for the local and domain administrator account so it appears you are logging in as the same administrator user when in actuality you are not.  The error you provided specifically states &amp;#39;servername\administrator&amp;#39; which is the local administrator account.

EXCHANGE

when I am using administrator credentials to log into my mailbox server, I am getting ERROR: active directory failed on server servername\administrator on bind operation is invalid, error coe 0x31, it was running command get-receipient resultsize 1000 -sortby &amp;quot;display name - receipient type &amp;quot;user mailbox&amp;quot; 

and I don&amp;#39;t see any mailbox in EMC

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.