New Post: Certificate issue with Windows Sever 2012 ?

Pls check the Build from your Upstream WSUS. Here you will see where you see the correct build:
http://www.wsus.de/images/wsus-version.png

In WSUS-FAQ No. 44 you see the KB-Numbers and the Build Numbers: http://wsus.de/faq

WSUS 3.0 (SP2): Build 3.2.7600.226
WSUS 3.0 (SP2) + KB2720211: Build 3.2.7600.251
WSUS 3.0 (SP2) + KB2734608: Build 3.2.7600.256
WSUS 3.0 (SP2) + KB2828185: Build 3.2.7600.262
WSUS 3.0 (SP2) + KB2938066: Build 3.2.7600.274

On a WSUS which is installed on W2008R2 or lower, your WSUS have to had Build .274.