What ports are required for Exchange 2003 running under Windows Small Business 2003?

Good morning,

I need to switch out our router which is no longer accessible because a factory reset is needed. With that in mind I need to add all of the necessary ports to the router firewall section and am wondering if there's a fail safe list available that includes all of the ports needed.

There are users who are working remotely and when the new router was temporarily put in place they had no access. Could somebody please let me know if there's a good list of ports that need to be added?

Thanks in advance!
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Glen KnightCommented:
The ports required for SBS2003 are listed here:


However, if it's just for Exchange your interested in then, port 443 for OWA/ActiveSync and port 25 for SMTP delivery of mail.

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The list supplied in the above post is an exhaustive list and I would suggest that you only forward the ports required.  If you provided a list of the services required, we can advise on which ports to select.
The common ones are
SMTP  25
RDP    3389
Remote Web Workplace 4125
Secure Web   443

If you host a web site, you will need Port 80
If you need to allow remote POP3 access then Port 110
If you need VPN access then 1923 for PPTP and 1701 for L2TP
For FTP you will need Port 21
Glen KnightCommented:
The list I supplied is the same list you will find on technet here: http://technet.microsoft.com/en-us/library/cc700836.aspx

As for port 80 there is no reason you should need to open this port on an SBS server unless you are hosting your own website, which is not recommended.  Port 110 is for POP3 which by default is disabled on any Exchange Server.
Poly11Author Commented:
Thank you!
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