We have an Exchange 2007 SP2
single server that was working correctly yesterday and for a couple of years without issues. Outlook Anywhere was not setup on the server and I received a request to set it up.
I enabled Outlook Anywhere and saw that the RPC over HTTP Proxy component wasn't installed. After installing the Windows Component, I re-enabled Outlook Anywhere. After a while and testing, Outlook Anywhere was not working properly and testing with exRCA. During my testing I enabled Basic and Windows Authentication on the /RPC virtual directory. I ended up disabling Outlook Anywhere to test during the weekend.
The error on exRCA was returning was: An RPC error was thrown by the RPC Runtime process. Error 14 14
As of this morning, Outlook clients are continuously being prompted for password
. Most of the clients are Outlook 2010 and 2013. Outlook Anywhere is not enabled on the clients, so Outlook is not attempting to use RPC/HTTP.
Password prompts appeared:
When starting Outlook
When sending an email
However, it does not appear to affect Outlook functionality. Outlook is still able to send and receive emails, so email is not down, it's just a big annoyance for end-users.
Disabled Outlook Anywhere from EMC
Set Authenticated Users Permissions on /OAB and /ExchangeOAB folders to read&execute
I thought the password prompts were happening during OAB synchronization
Enabled Kernel Mode Authentication
under Windows Authentication on the /RPC virtual directory
This seems to have decreased the overall amount of password prompts being received, but the password prompts still occur when starting Outlook