Exchange 2013: Cannot log into EAC becuase of error 404 - File or directory not found

Good morning,
This morning, I was able to access the Exchange Admin Center. However, I am able to access the EAC now because of this error "404- File or directory not found. The resource you are looking for might have been removed, had its name changed, or is temporary unavailable."
could you please give me hints how troubleshoot it?
Thanks,
dongocdungAsked:
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dongocdungAuthor Commented:
i fixed it. Thanks,
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dongocdungAuthor Commented:
My environment is in a coexistence scenario.
If I access it using this link
https://<CASServerName>/ecp
However, it does not work if I use the format below:
https://CAS15-NA/ecp?ExchClientVer=15

I am also able to access EAC from Office 365.
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wakatashi1Commented:
Possibly daft question, but if it works when you use the first URL you specified, could you not just do that?
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dongocdungAuthor Commented:
I would like to access the EAC using the second link. so, I have the feature "Hybrid" to configure Exchange 2013 with Office 365.
Please see two pics that I attach to see the differences.
thanks
EAC.png
EAC2.gif
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dongocdungAuthor Commented:
I fixed by myself
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rick81Commented:
what was the fix for this?
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