Re: Blocking Yahoo Messenger With Firewall??

From: NâCN (NâCN_at_risk.com)
Date: 11/20/05 

Date: Sun, 20 Nov 2005 11:03:07 -0800

Old Guy:
  Thanks for reply, and this is for a small company. We have a
SonicWall , but looking around on there site all I could find was them
wanting to sell a subscription service to go with the firewall. My
opinion... what we paid for that I sould be able to do it with out
futher costs.

When I started there and after a few months I approached Mr. Big about
setting up some policies and he responded... "We aren't that draconion
here". I have never drawn up policies or even read a copy of a
companies policies.

I would like to stop the Messenger because of virus threats.

I did a Goolge search long before coming here and was also in an
online forum. This was sort of my last resort.

Yes there are many hits on a Google search and I read the first 2 1/2
pages of hits. They was no one with success or they want to sell you
a client side software solution. Of course if you have read one of
the hits you saw in your Google search that was productive I would
appreciate the link. The closest I saw to a solution was blocking the
login servers by name, but you have to monitor for Yahoo adding new
server names to the list.

Thanks again,
NaCN

On Sat, 19 Nov 2005 12:42:40 -0600, ibuprofin@painkiller.example.tld
(Moe Trin) wrote:

>In the Usenet newsgroup alt.computer.security, in article
><pbasn15550f0cmq2rbi2vcae16lld3oi41@4ax.com>, NaCN wrote:
>
>>Well, I was hoping to just do it with a firewall (hardware).
>
>google is your friend - search for 'blocking Yahoo+Messenger'. If you
>really have to go this route, rather than trying to block ports, block
>the address ranges assigned to Yahoo. 66.163.160.0/19, 66.94.224.0/19,
>and 216.155.192.0/20 would be a good start.
>
>>We really don't have policies and I don't have the experience to draw
>>them up.
>
>If this is NOT a family situation (you trying to keep your kid from using
>the service, or similar), you REALLY DO NEED TO have written policies.
>Depending on what country you are in, you could be in violation of laws
>at a country (federal) level, state (sub-division of a country), or
>if in Europe, supranational level stuff (such as EU regulations). If
>this is the case, consult a legal professional. REALLY. Policy really
>does make the solution trivial, unlike hardware solutions.
>
>If this is a family situation, you have far larger problems than a written
>policy or hardware firewall can solve.
>
>>Places to look for a hardware solution would be appreciated.
>
>If you mean a place to shop - obviously, that depends on where you are
>located. In the USA, even office supply stores like OfficeMax can sell you
>the cheap hardware routers suitable for a small installation (such as a
>home, or small office). Larger facilities - contact your network supplier
>such as Foundry, Cisco, 3Com, etc.
>
>If you mean more information about the solution, you could look at the
>Usenet newsgroup 'comp.security.firewalls' (the only other newsgroup that
>even vaguely looks on topic is 'alt.comp.networking.firewalls' and it only
>sees an occasional post, mainly from spammers).
>
> Old guy

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