Windows Small Business Server 2011 Port Forwarding
SMTP 25 - Simple Mail Transfer Protocol
HTTP 80 - Home Page Web
SSL 443 - Home Page Web Secured HTTPS (RWA, OWA, remote desktop or Terminal Server sessions)
PPTP 1723 - VPN Connections
Windows Small Business Server 2008 Port Forwarding
SMTP 25 - Simple Mail Transfer Protocol
HTTP 80 - Home Page Web
SSL 443 - Home Page Web Secured HTTPS (RWW, OWA, remote desktop or Terminal Server sessions)
HTTP2 987 - Second SSL Secured on alternate port for SharePoint (optional)
PPTP 1723 - VPN Connections
Windows Small Business Server 2003 Port Forwarding
SMTP 25 - Simple Mail Transfer Protocol
HTTP 80 - Home Page Web
SSL 443 - Home Page Web Secured
HTTP2 444 - Second SSL Secured on alternate port for SharePoint
PPTP 1723 - VPN Connections
RDP 3389 - Remote Desktop Protocol (only needed for direct access, if using RWW website, only 4125 is needed)
RWW 4125 - Remote Web Workplace
Optional:
POP3 110 - If using POP3 mail connections
IMAP 143 - If using IMAP mail connections
IMAP SSL 993 - If using IMAP SSL mail connections