how can i login to Exchange Admin Center 2013?
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AklaounAuthor Commented:
Hello Sirs,
 i cannot log in to Exchange Admin Center anymore due to an error of certificate.
Chad FranksSenior System EngineerCommented:
you need to make sure you have a valid certificate.  Starting with Exchange 2013 you have to have a valid SSL certificate to use any of its functionality.  If you need access to this Exchange outside the company I.E.  OWA etc you will need a third party SSL cert.  Godaddy, Thawte,  Symantec etc..

if you just need to access it internally all you need is a self sign cert.  You then need to make sure the SSL is trusted in the trusted root.

I use OpenSSL to create all my self-signed certs:

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AklaounAuthor Commented:
Thank you Chad for the reply.
i have Server 2012 R2, how can i create as you mentioned?
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AklaounAuthor Commented:
i use it internally only the exchange.
Chad FranksSenior System EngineerCommented:
you want to create it from Exchange...

here is a good site that explains it:
AklaounAuthor Commented:
Dear Chad,
thank you for your reply,

As i told you on my first question that i cannot login to Exchange Admin Center, i fill in with the credentials  after i got a blank page.\

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