Outlook Username/Password Popups after Exchange 2013 CU3 Upgrade

Event ID: 1309 Source: ASP.NET – Exchange 2013

The last few days my Exchange server (Passive) starting with all these errors, I did an IISRESET and it worked for about 10 min and then the issues started again. After this I was also seeing other strange events logged, OWA errors, IIS errors every 5 min, my event...