Yup. Just enable windows firewall and go to the properties of the firewall and set the appropriate rules.
21,80,443,3389,25,110 and 143 (IMAP) if you use it.
Steve Schofield
Windows Server MVP - IIS
http://weblogs.asp.net/steveschofield
http://www.IISLogs.com
Log archival solution
Install, Configure, Forget