Re: blocking some common TCP/UDP ports

From: Steven Umbach (n9rou_at_n0spam-comcast.net)
Date: 02/27/04 

Date: Fri, 27 Feb 2004 05:11:34 GMT

I don't know of a way to do that at the client end, at least with Outlook
Express. -- Steve

"Jodie" <jodie.fearon@cesjm.com> wrote in message
news:uLwx2mG$DHA.2808@TK2MSFTNGP10.phx.gbl...
> Another quick question...
>
> I want to be able to block certain users from sending attachments in their
> email. Is there anyway I can configure this at each workstation? We do not
> have our own email server. The workstations are Win2K Pro and XP Pro and
> the PDC is an NT Server 4.0
>
>
>
>
> "Steven L Umbach" <n9rou@nospam-comcast.net> wrote in message
> news:X_Q_b.7990$AL.150093@attbi_s03...
> > You may be doing this already, but it is best to have a block all default
> rule for
> > outbound access and then add the allowed exceptions. I will leave a link
> or two, but
> > you may have better luck searching http://google.com for the associated
> ports such as
> > "Yahoo messenger ports" or try to track them down yourself by using
> something like
> > TCPView [free from SysInternals] to see what ports are used on a test
> computer or
> > view your firewall logs. --- Steve
> >
> > http://www.sysinternals.com/ntw2k/source/tcpview.shtml
> > http://www.iss.net/security_center/advice/Exploits/Ports/
> > http://www.governmentsecurity.org/articles/CommonPorts.php
> >
> > "Jodie" <jodie.fearon@cesjm.com> wrote in message
> > news:%23rg8LGx%23DHA.4012@tk2msftngp13.phx.gbl...
> > > I have an NT Server running firewall on my network to allow shared LAN
> > > access to the internet. I want to be able to prevent downloads and
> uploads
> > > EXCEPT from specified IP addresses.
> > >
> > > I would also like to block MSN Messenger and Yahoo instant messenger
> unless
> > > from specified IP addresses.
> > >
> > > I want to allow HTTP only from most IP addresses and block MSN
> Messenger,
> > > Yahoo Messenger, WinMX, Kazaa and all other common internet file sharing
> > > systems.
> > >
> > > My firewall allows my to do packet filtering based on protocols and
> their
> > > port numbers. Can anyone tell me what are the common port numbers for
> these
> > > applications or know where I can find that information? I now the
> general
> > > number for HTTP, FTP etc. but I do not know what port number WinMx and
> the
> > > others use.
> > >
> > > Thanks.
> > >
> > >
> >
> >
>
>

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