Close ports

[Guest]

Hi
I have read all the hardening docs proposed on this discussion group which i
found really helpful. I have so far upgraded all my servers etc with the
latest service packs and security updates but I would like to close all ports
but the required on say for instance my smpt server i closed everything but
dns ports and 25 but i could not resolve names where do you guys get the
information on what ports can be closed.

many thanks for any help you may be able to give me

ca

 

[Srikrishna Komatineni]

You need to open TCP/UDP 53 for your DNS queries..
Other than that depends on your services or requirements you may want to
open those ports as well...
http://www.portsdb.org this can be somwhat usefull...

 

[Guest]

There are more ports than just LDAP and DNS (TCP/UDP 53) to ensure that
Win 200x and Active Directory work.

For a start, check out:

http://support.microsoft.com/default.aspx?scid=kb;en-us;832017

Do let us know if it helps. Thanks.