Blocking MSN / Yahoo Messenger

Posted on 2008-10-07
Last Modified: 2012-05-05

Can anyone details how I block both MSN & Yahoo Messenger on my PIX 501 running V6.3

Thanks in advance
Question by:dt3itsteam
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Assisted Solution

Cvif3v3r earned 20 total points
ID: 22663654
This link tells you the Ports and IP addresses for MSN and Yahoo Instant Messenger. How to do it specifically on the Pix 500, I do not know, but I hope this helps at least.
LVL 12

Assisted Solution

Pugglewuggle earned 60 total points
ID: 22666124
You should be able to setup a default inspection rule to block this... the ASA has predefined rules in the ASDM that are designed to block certain kinds of traffic such as this and other things like bittorrent and limewire... you just need to enable them.
If you go to the configuration tab in the ASDM and the go to firewall >> advanced you will find the inspection section... it should be fairly easy to setup blocking as the different items are listed by name.
Let me know if you have any questions! Cheers!

Accepted Solution

devangshroff earned 45 total points
ID: 22667150
but these mesanger keep on changeing port , so will ASA will block this.
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Author Comment

ID: 22668142
Can someone post me the Cisco command lines for the required statements?
Many thanks!

Assisted Solution

devangshroff earned 45 total points
ID: 22668175
class-map type regex match-any msn_exempt_list
match regex msnuser1 "booobs\"
match regex msnuser2 "user\"

class-map type inspect im match-all MSN_BLOCK_CLASS
description "blabla"
match protocol msn-im
match login-name regex class msn_exempt_list

policy-map type inspect im MSN_BLOCK_POLICY
description "Policy blocking MSN IM"


service-policy MSN_BLOCK_POLICY interface outside
LVL 12

Expert Comment

ID: 22671860 Are you crazy devangshroff?
While these commands will work, that's awesomely funny! What's up with that? :-P
LVL 12

Assisted Solution

Pugglewuggle earned 60 total points
ID: 22671882
One other thing - that only blocks IM for and
You need to have a wildcard regular expression.
Here is the Cisco article on Regular Expressions.
Let me know if you have any questions!
LVL 12

Assisted Solution

Pugglewuggle earned 60 total points
ID: 22672034
Oh - check this out - here is a screenshot from my ASDM - there is a default rule for blocking MSN Messenger, Yahoo Messenger, and lots of other things.
Just activate these policies. No need for booobs or devangshroff's commands. Lol.
Cheers! Let me know if you have any questions!


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