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Exchange 2013 Troubleshooting: Unable to send email on OWA

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In Exchange 2013 your users might encounter the following error when trying to reply or create a new email or choose a recipient from the address book:

"Error: Your request cant be completed right now. Please try again later."

https://collaborationpro.com/wp-content/uploads/2016/09/ex13owa-300x131.jpg

On your Exchange 2013 Mailbox Server, if you open IIS and navigate to Exchange Back End -> OWA ->Authentication Methods and enable Anonymous Authentication.

Once complete perform an IISRESET on the server:

https://collaborationpro.com/wp-content/uploads/2016/09/ex13owa1-300x203.jpg

Now going back to OWA you can now reply to emails and choose users from the address book as shown below:

https://collaborationpro.com/wp-content/uploads/2016/09/ex13owa2-300x141.jpg

<> You can reproduce this by simply disabling the above authentication and refreshing OWA.