Starting April 2008 Yahoo 8.x IM Clients Cannot Connect or are Bypassing IM Manager/Symantec Mail Security Appliance

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Starting April 2008 Yahoo 8.x IM Clients Cannot Connect or are Bypassing IM Manager/Symantec Mail Security Appliance

Question/Issue:
Yahoo 8.X IM clients cannot connect or are bypassing IM Manager or the Symantec Mail Security Appliance.

Symptoms:

DNS redirection used to point Yahoo IM clients to IM Manager.
Yahoo hostname mcs.msg.yahoo.com is not redirected to IM Manager server or Symantec Mail Security Appliance.
The following command is run from an IM desktop> Windows Command Prompt and does not return the IP address of the internal server:

ping mcs.msg.yahoo.com

Solution:
Configure the internal DNS that IM clients use to point the hostname mcs.msg.yahoo.com to the IM Manager/Symantec Mail Security Appliance server.

See the IM Manager Implementation Guide section "Creating forward look-up zones on your internal DNS" for more details on the internal DNS configuration
See the Symantec Mail Security Appliance Implementation Guide section "Configuring your DNS for IM filtering" for more details on the internal DNS configuration.

References:
IM Manager documentation is available at:
http://www.symantec.com/business/support/documentation.jsp?language=english&view=manuals&pid=50987

"How to Redirect AOL, MSN, Yahoo, ICQ, Googletalk IM Clients to IM Manager Using a Windows Hosts File" at:
http://service1.symantec.com/SUPPORT/ent-gate.nsf/docid/2007223164841598

"List of public Instant Messaging servers for IM Manager DNS redirection setup" at:
http://service1.symantec.com/SUPPORT/ent-gate.nsf/docid/2007645475208898

Document ID: 2008040409223654
Last Modified: 09/25/2008
Date Created: 04/04/2008
Product(s): Brightmail Gateway, IM Manager, Symantec Mail Security 8200 Series
Release(s): 7.5, 7.6, BG 2007 7.5, BG 2007 7.6, BG 2007 7.6.1, IM Manager 2007 8.3, IM Manager 8.1, IM Manager 8.2, IM Manager 8.4