Are all databases members of the same RPC client access array? Are you running split DNS? Have you validated ExternalUrl and InternalUrl on all servers (and InternalNlbBypassUrl where relevant)?
From: listsad...@lists.myitforum.com [mailto:listsad...@lists.myitforum.com] On Behalf Of Hugo Hernandez Sent: Thursday, January 28, 2016 6:42 PM To: excha...@lists.myitforum.com Subject: [Exchange] Outlook 2010 Directory type connection changes from RPC/TCP to HTTP asks for username and password We just recently went from a typical single Exchange 2010 install to a three server DAG. All three servers have the typical installation and for the most part everything seems to be going ok except for one thing. It seems that randomly the Outlook connection for the Directory changes from RPC/TCP to HTTP and a username and password prompts appear. Even if we leave the password prompt up, mail will flow since this only seems to effect the connection to the directory. Once we enter username and password Outlook is happy again until the connection somehow resets and prompts the user again for authentication. This is happening to a handful of users out of 100 so far and I can't seem to figure out why. I have the event logs on all three servers and they are relatively clean. Server specs are as follows. All three servers are identical. -Server 2008 R2 Enterprise fully patched -Exchange 2010 SP3 RU11 -Typical roles installed -Static ports assigned to RPC and AB -All are behind a hardware load balanced -All internal clients are Outlook 2010 I have searched around but I couldn't find anything that is close to what I am experiencing. Any ideas on where to look next? Thanks, Hugo Hernandez Network Administrator Insteon It's your house. Turn it on. www.insteon.com<http://www.insteon.com/> Smarthome Home Automation Superstore www.smarthome.com<http://www.smarthome.com/> ======================================= CONFIDENTIALITY NOTICE: This e-mail message is intended only for the person(s) or organization(s) to whom or which it is addressed and may contain information which is confidential and privileged. The unauthorized use, copying, distribution, or disclosure of this e-mail or any of its contents by anyone other than the intended recipient is unauthorized and unlawful. If you have received this e-mail in error, please notify the sender immediately and destroy all copies of this transmission. Thank you. http://www.smartlabsinc.com/
