Mektozo , Just another Contoso ! :)

I have faced a problem at a cusomter site;mails  cannot flow from an Exchange 2010 server to a specific Exchange 2003 server , while it can flow to other Exchange 2003 servers. Exchange 2010 servers were in AD domain: ChildA.parent.com and Exchange 2003 server was in ADdomain : ChildB.parent.com. Domain controllers of domain ChildB.parent.com only existed at the site of Exchange 2003. The queue viewer gave the following message : " 451 4.4.0 Primary Target IP Address Responded with (501 5.5.4 Auth Command Cancelled) "  and the application log gave the following error: Outbound authentication failed with error -2146892976 for Send connector Intra-Organization SMTP Send Connector. The authentication mechanism is Gssapi. The target is SMTPSVC/Exchange2003ServerFQDN i have checked the SPN , using Setspn -l Exchange2003ServerName aother posts on the Internet suggested, the SPN was not in place so i had to add it using : setspn -a SMTPSVC/Exchange2003ServerFQDN Ex...

Hello !, Synchronizing time between computers in a windows server 2008 domain environment is an easy task, but there are some cinsiderations if your domain controllers are virtual machines hosted on Hyper-V. You have to remove the "Time Synchronizaiton" feature from the "Integration Services" from the Virtual Machine Settings , otherwise the Virtual machine will by synchronizing it's clock from ther Hyper-V host and this may lead to problems if the clock on ther Hyper-V changes to any reason.