Exchange 2013 OWA Login Error HTTP 500

Question

I installed Exchange 2013 on Windows Server 2012.
After restarting the Host I could not login into owa or ecp the login screen showed up but after entering my correct credentials I would get a
HTTP 500 Error on https://localhost/owa/auth.owa
The error persited after multiple reboots of the Exchange server.
Some googling revealed to me that this might be caused by the Forms Based Authentication Serivce not running.
But looking at the Services List I cant seem to even locate it. (I believe that the service belongs to MS-exchange 2010 only)
Anyone got any idea why this might happen or could give me the exact name of the service or help solve the problem.
tnx

Answer 1

Hi
Anonymous Authentication is enable and SSL is checked on but enabling those you said above gave me this error :
challenge-based and login redirect-based authentication cannot be used simultaneously
here is the result of executing those commands:
Identity                      : SRV01-EX2013\ecp (Exchange Back End)
InternalAuthenticationMethods : {Ntlm, WindowsIntegrated}
BasicAuthentication           : False
WindowsAuthentication         : True
DigestAuthentication          : False
FormsAuthentication           : False
LiveIdAuthentication          : False
AdfsAuthentication            : False
OAuthAuthentication           : False
ExternalAuthenticationMethods : {Fba}
Identity                      : SRV01-EX2013\ecp (Default Web Site)
InternalAuthenticationMethods : {}
BasicAuthentication           : False
WindowsAuthentication         : False
DigestAuthentication          : False
FormsAuthentication           : False
LiveIdAuthentication          : False
AdfsAuthentication            : False
OAuthAuthentication           : False
ExternalAuthenticationMethods : {Fba}
Identity                      : SRV01-EX2013\owa (Exchange Back End)
InternalAuthenticationMethods : {Ntlm, WindowsIntegrated}
BasicAuthentication           : False
WindowsAuthentication         : True
DigestAuthentication          : False
FormsAuthentication           : False
LiveIdAuthentication          : False
AdfsAuthentication            : False
OAuthAuthentication           : False
ExternalAuthenticationMethods : {Fba}
Identity                      : SRV01-EX2013\owa (Default Web Site)
InternalAuthenticationMethods : {Basic, Fba}
BasicAuthentication           : True
WindowsAuthentication         : False
DigestAuthentication          : False
FormsAuthentication           : True
LiveIdAuthentication          : False
AdfsAuthentication            : False
OAuthAuthentication           : False
ExternalAuthenticationMethods : {Fba}
please help !
thank you in advance