Can't login to OWA using an external address

Hello guys,

I have mailboxes which located on Exchange 2010 server's Database and few of them are created on Exchange 2013.

When I open OWA using external URL and login on a mailbox that located on Exchange 2010 I have no problems, but if I login using the one which I have on Exchange 2013 I receive such error:

A server configuration change is temporarily preventing access to your account. Please close all Web browser windows and try again in a few minutes. If the problem continues, contact your helpdesk.

Could anyone help me to resolve the issue, please

Thank you in advance!

April 9th, 2015 2:29am
Is the external URL pointed to the Exchange 2010 or Exchange 2013 server?  It should be the Exchange 2013 server.
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April 12th, 2015 4:38pm

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