Dear all,

In my office, we have 2 multi roles exchange server that configured in DAG, this error shown up after 3 days ago our server are down,

the problem is when i try to create new profile on outlook in new computer (joined domain) it show error about autodiscover, show i try to browse the autodiscover virtual directory from IIS manager show this error below,

in server 1,

In server 2,

i have been try to create new autodiscover virtual directory but still shown up a same error like the picture before. Do we need to update our exchange server to CU9 or is there another solution that i can use to solve this error?

NB : i'm sorry about my english. :)

Thanks & Best Regards,

Iyus Dedi

It reminds me https://exchangeranger.wordpress.com/2015/06/12/exchange-2013-cu8-application-event-warning-1310-microsoft-exchange-security-assembly/

But CU9 installation is not a bad idea as well - it reinstalls binaries and sometimes it helps to resolve issues when some file is missing or incorrectly registered.

Hi lyus,

Thank you for your question.

It could not load the assembly Microsoft.Exchange.Diagnostics due to incorrect entry in the application web.config file. We could refer to the following steps to check if the issue persist:

Take a backup of web.config in "C:\Program Files\Microsoft\Exchange Server\ClientAccess\Autodiscover".

- Open web.config from C:\Program Files\Microsoft\Exchange Server\ClientAccess\Autodiscover in notepad.

- Replace all "file:///%ExchangeInstallDir%" with "file:///C:\Program Files\Microsoft\Exchange Server\" where C is the drive where Exchange is installed.

- Save the file.

- Open an Administrator command prompt and run IISreset /noforce

- Test browsing https://servername/autodiscover/autodiscover.xml

If there are any questions regarding this issue, please be free to let me know.

Best Regard,

Jim