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i'm sorry, i was in vacation in the last time and i want also to say thank you for your replays.
Yes, is a problem with the authentication, but i cannot localized where it is.
the exchange servers are in the europa.contoso.com installed.
the administrator user from contoso.com domain can connect directly to the exchange server, but not from a terminal server in asia.contoso.com domain.
I will appreciated any helpful replay.