After replacing the self sign exchange certificate with trusted certificate publisher, you need to change the exchange services URL’s accordingly to mach the names on the certificate :
How to change exchange internals/externals URL’s
As a result the free&busy become unavailable and grey out lines pop on both outlook when scheduling meeting and on OWA on the same page . First thing is to check the Obvious and find if the autodiscover DNS record is set right, the best place to start is with Microsoft Remote Connectivity Analyzer , You can check “Outlook Autodiscover” there . After passing that stage check your connectivity internal with :
Test-OutlookWebServices -identity <your email or alias>
You should get success’s on all the test how ever if you get error massage regarding client access server :
Id : 1011 Type : Error Message : When querying Availability for the recipient e-mail address user@your_domain.com , the following error code and message we are received: ErrorServiceDiscoveryFailed:Unable to find a Client Access server that can serve a request for an intraforest mailbox SMTP:user@your_domain.com AND Id : 1025 Type : Error Message : [EXCH] Error contacting the AS service at https://<Your FQDN>/EWS/Exchange.asmx. Elapsed time was 15 milliseconds.
That could mean you are missing some External/external URL’s in webservicesvirtualdirectory , run :
Get-WebServicesVirtualDirectory | fl name,*url*
Make sure you have them all covered including InternalNLBBypassUrl , you should get :
Name : EWS (Default Web Site) InternalNLBBypassUrl : https://<FQDN of your server>/ews/exchange.asmx InternalUrl : https://<FQDN of your server>/EWS/Exchange.asmx ExternalUrl : https://<External FQDN of your server>/ews/exchange.asmx
If missing just add them, example to add internalNLBBypassUrl URL :
set-WebServicesVirtualDirectory -Identity "<Server name>\EWS (Default Web Site)" -InternalNLBBypassUrl https://<FQDN of your server>/EWS/Exchange.asmx
After resetting your IIS running IISRESET from command prompt your free busy potion will work again !