As I mentioned on my previous blog post, it is fine to install Windows 2008 R2 SP1 on machines running Forefront Threat Management Gateway (TMG) 2010 and Forefront Unified Access Gateway (UAG).
Yesterday ISA/TMG team blogged about this subject making an official statement: “TMG 2010 SP1 and UAG 2010 SP1 are fully compliant with the new Windows service pack. ”
Although, there are some points you should observe and order you should follow when planning deploy Service Pack 1 on TMG 2010:
1. Enterprise Management Servers (master and replicas – only for TMG deployments).
2. Array managers.
3. Array members.
Check ISA/TMG team blog post for more info.
That´s it! Plan, test and update!! In this very order 
Regards,
Paulo Oliveira.
Hi,
I have installed ISA server 2006 on Winodws 2003 server R2 (enterprise edition) on Dell PowerEdge 2600.
After the completion the installation of ISA, my Internet is not works.
Can you help me regarding this?
Regards
Kashif Noor
Hi Kashif,
by default, after you install ISA firewall it blocks all traffic. You must create an explicit access rule allowing needed traffic only.
Regards,
Paulo Oliveira.
Hi and thanx for reply,
I was made up accessing rule through Firewall Policy Rule but the Internet still not working on my Single LAN adapter.
Regards
Hi,
you may want to check this link: http://technet.microsoft.com/pt-br/library/cc302586(en-us).aspx
Altough, it is intended to ISA 2004, still works on ISA 2006.
Regards,
Paulo Oliveira.