Hi, in my network i've 3 DC: dc1 DNS, DC, GC, FSMO (10.0.0.1) dns 10.0.0.1, 10.0.0.2 dc2 DNS, DC, GC (10.0.0.2) dns 10.0.0.1, 10.0.0.2 dc3 DNS, DC (10.0.0.3) dns 10.0.0.1, 10.0.0.2 the problem is than when the dc1 is down and i restart dc2, the logon process is very slow 5 minutes and also the stratup of dc2's services are very slow, after 5 minutes all work fine, when dc1 is up no problem appear, on dc3 there are no problem, I've try to set 10.0.0.2 as first dns server of dc2 but without results, have you soma suggests?

Let each DC/DNS server points to itsef as primary DNS server and to other DNS servers as secondary ones and check again. This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration

Hello, if the DNS server that is configured as preferred on the NIC is not available the fail over to another DNS server is not immediately. There are multiple tries to use the preferred before the next one from the NIC is chosen.Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

Ok but if I set the prefered DNS itself the problem remains!

Please run ipconfig /registerdns on the DC and restart netlogon service. Once done, check again. This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration

already tried

Have you tried it after changing IP config settings? Please make sure that all is okay with your DNS records. This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration

Hello, please post an unedited ipconfig /all form all DC/DNS servers.Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

I've solve the problem, the error was that not al GC was correctly registered in a DNS! Thankyou!