Installation of Exchange 2016-Learning to Edit Web.config
Next we should add the following two lines to Outlook Web App Web.config file (this file is genrally located at the folder C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\Owa). These two lines must be added under the <AppSettings> node in the Web.config file, and such procedure must be carried out only on the backend servers (Mailbox Server) where Outlook Web App has been setup and installed.
Over you Exchange server, navigate to surf on C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\Owa) , then right click on web.config file and select properties
Click on permission tab and then confirm that your account has full control access to the file and then click on “OK” button.
Now right click on the same file and select open with: notepad. In notepad click on option Edit – find (or ctrl+F)
Enter all these values right under <appSettings>
<add key=”IMCertificateThumbprint” value=”2FA5B4B48F0DBE4C73455E8270C5CA7FD9EF6AF5″/>
<add key=”IMServerName” value=”skype.domain.as”/>
Where skype.domain.as is FQDN of your Skype Frontend Server and IMCertificateThumprint is the thumbprint we got earlier. It is going to look like this:
Duly save the file and then close it.
After you have edited and updated the Web.config file you must then execute the following command over the Exchange backend server in context to recycle the Outlook Web App pool:
C:\Windows\System32\Inetsrv\Appcmd.exe recycle apppool /apppool.name:”MSExchangeOWAAppPool”
In case successful, you are going to see the message: “MSExchangeOWAAppPool” successfully recycled