Hi, I have 2 AD sites with following configuration: Site A: AD01 AD02 CAS01 CAS02 HUb01 Hub 02 MBX01 MBX02 Site B: AD03 CAS03 HUB03 MBX03 CAS 01 is internet facing i.e has internal as well as external URL. CAS02 and CAS03 has only internal URL. If users tries to access their mailbox in SITE A from SITE B CAS03 server, CAS03 doesn't proxy to CAS01 or CAS02 server. Instead gives error message "A server configuration change is temporarily preventing access to your account. Please close all Internet Explorer windows and try again in a few minutes. If the problem continues, contact your helpdesk." Kindly Help !! Regards, Somdeep Singh Yadav,MCTS

Hi I think you should post this question in the Exchange Deployment forum: http://social.technet.microsoft.com/Forums/en-US/exchangesvrdeploy/threads Steve

This should definitely be in one of the Exchange Server forums. I will move it to the Deployment forum. Karl When you see answers and helpful posts, please click Vote As Helpful, Propose As Answer, and/or Mark As Answer My Blog: http://unlockpowershell.wordpress.com My Book: Windows PowerShell 2.0 Bible My E-mail: -join ("6B61726C6D69747363686B65406D742E6E6574"-split"(?<=\G.{2})",19|%{[char][int]"0x$_"})

hi, What's the setting of the authentication on your iis OWA. You must set your cas02 and cas03 enbale intergrated windows authentication and disable FBA. hope can help you thanks,CastinLu TechNet Community Support

hi, What's the setting of the authentication on your iis OWA. You must set your cas02 and cas03 enbale intergrated windows authentication and disable FBA. hope can help you thanks,CastinLu TechNet Community Support