Hello,
I have two Exchange 2013 server set up in High Availability configuration, and suddenly two days ago a single user started complaining that (sometimes and randomly) when he goes to open an attachment in OWA a new window opens and he is prompted for his login creds. It doesn't seem to matter which database is active at either site and of course every time I test it using his account, the problem doesn't happen. Anyone got any ideas as to what is going on here? I can't find any information about this issue relating to Exchange 2013 on the Internet. Webready Document Viewing is enabled on both servers.
Any help is greatly appreciated!