With Exchange 2013 CU1 out only days ago, I upgraded my Exchange from 2010 to 2013 and the OWA decided to stop working. It works internally so I know the configuration on the Exchange is good. If I open the 443 port directly to Exchange the external access works as well.
So I am very sure it's my IIS ReWrite module that is causing trouble. It worked very well in 2010 OWA but in 2013 I get errors when I log into the OWA. The error is: "Error: Your request can't be completed right now. Please try again later." and if I browse around a bit I get errors such as "The server method 'GetList' failed.".
So, as I have concluded, this is the cause of the ReWrite on my reverse proxy server. I'm only using ReWrite module to reverseproxy the OWA and my setup is as follow:
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<rewrite>
<rules>
<rule name="ReverseProxyInboundRule1" enabled="true" stopProcessing="true">
<match url="(.*)" />
<action type="Rewrite" url="https://mailserver.domain.local/{R:1}" />
<serverVariables>
</serverVariables>
</rule>
</rules>
</rewrite>
<urlCompression doStaticCompression="false" />
</system.webServer>
</configuration>
Can anyone point me in the right direction here? Obviously something must have changed in Exchange 2013 OWA?