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the easiest way is to add records to your DNS server (if you have one) to both talk.google.com and talkx.l.google.com, returning 127.0.0.1. <br />
<br />
otherwise you can firewall access to the google talk servers, but the actual addresses might change. I found this page that lists all the stuff you need to block access to:<br />
<a href="http://googledoll.blogspot.com/2009/08/how-to-block-gtalk-using-microsoft-isa.html" rel="ugc">http://googledoll.blogspot.com/2009/08/how-to-block-gtalk-using-microsoft-isa.html</a><br />

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HI,<br />
<br />
Please reger this page howto do it on asa:<br />
<br />
<a href="http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a0080940e04.shtml" rel="ugc">http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a0080940e04.shtml</a><br />

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Here you go<br />
<br />
object-group network Google-Talk-Servers<br />
&nbsp;network-object host 216.239.37.125<br />
&nbsp;network-object host 72.14.253.125<br />
&nbsp;network-object host 72.14.217.189<br />
&nbsp;network-object host 209.85.137.125<br />
object-group service Google-Talk-Ports tcp<br />
&nbsp;port-object eq 5222<br />
&nbsp;port-object eq 5223<br />
&nbsp;port-object eq https<br />
access-list outbound line 1 deny tcp any object-group Google-Talk-Servers object-group Google-Talk-Ports<br />
<br />
where &quot;outbound&quot; id the name of your outbound access-list - if you do not have an outbound access list you will also need to add<br />
<br />
access-group outbound in interface inside<br />
<br />
Pete<br />
<a href="http://www.petenetlive.com" rel="ugc">www.petenetlive.com</a>
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In fact This aroused my interest that much I wrote it up <a href="http://www.petenetlive.com/KB/Article/0000323.htm" rel="ugc">http://www.petenetlive.com/KB/Article/0000323.htm</a><br />
<br />
Pete<br />
<a href="http://www.petenetlive.com" rel="ugc">www.petenetlive.com</a>
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ASDM GUI gives you the ability to block the aforementioned ip addresses. If you need specific help, post back.
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I need to block users from being able to use Google Talk, but still have access to Gmail using the ASDM java web interface
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I need to block users from being able to use Google Talk, but still have access to Gmail using the ASDM java web interface

Block Google Talk on a Cisco ASA 5505

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.

Network Security

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).