How do you Scan ISA Server 2006?

[bsdit]

We have Lansweeper installed and running, i would also like to scan our ISA Server.

What Rules should I be putting ins ISA 2006 to allow me to scan as I get the following errors at the moment:

Cannot connect to DCOM port 135 : Firewalled? (ISAServerName) 12/01/2011 11:52:29
The RPC server is unavailable 0x800706BA (ISAServerName.domain.local, ISAServerName, 100.1.1.1)

[Hemoco]

Right click "Firewall Policy"
Go to "Remote monitoring","Microsoft Operations Manager"
Choose "Enable" and add your lansweeper server.
Click "Edit System Policy"
In Configuration Groups, select the Active Directory configuration group.
On the General tab, clear the Enforce strict RPC compliance check box.