Exchange 2013 Sp1 some users cant access owa

Question

After I install new exchange 2013 with sp1 on windows 2012 R2 server one for mail boxes and the second Client Access, i move all mail boxes to it, then i uninstall  the old server (exchange 213 with cu3).
All may exchange server’s virtual machines on hyper-v 2012R2
I install certificate and configure virtual directories
I notice some users can’t open there mail boxes from OWA they get a blank page after the enter username and password (from internal and external) (the same users can open outlook anywhere) at the same times many users can access owa.
After many restarts they can access OWA.
After some days some other users can’t access owa.
I remove ECP and OWA virtual directories, Then Recreate and configure it.
But the same problem some users cant access owa 
I install a new client access server, configure it
But the same problem

Answer 1

HI 
YOu can check below things to resolve the problem
Disable SSL from Default Web Site if you have enabled them
Check if you have set any redirection in the Default Website if so remove redirection and see the results
Ensure that you have a valid certificate for owa VD
check correctly the authentication type - windows authentication is enabled or if you have form based authentication enabled
Below is an example for enabling WA
set-Owavirtualdirectory -identity "servername\owa (Exchange Back End)" -WindowsAuthentication $True -Basicauthentication $false -Formsauthentication $false
Set-EcpVirtualDirectory -Identity "servername\ecp (Exchange Back End)" -WindowsAuthentication $true -FormsAuthentication $false 
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