Internet Security Systems Inc. (ISSX) CEO to Ring the NASDAQ Stock Market Opening Bell

MEDIA ADVISORY, Sept. 11, 2006 (PRIMEZONE) --

What: Mr. Thomas E. Noonan, President and CEO of Internet Security Systems Inc. (ISSX) will preside over the opening bell. Where: NASDAQ MarketSite - 4 Times Square - 43rd & Broadway - Broadcast Studio When: Tuesday, September 12th, 2006 at 9:30 a.m. EDT Contacts: Ed Eiland Manager, Investor Relations (404) 236-4053 eeiland@iss.net Angela Frechette Communications Specialist (404) 236-3197 afrechette@iss.net NASDAQ MarketSite: Stephanie Lowenthal; 646.441.5220

Feed Information:

The opening bell is available from 9:20 a.m. to 9:35 a.m. on uplink IA6 C band / transponder 24, downlink frequency 4180 horizontal. The feed can also be found on Waterfront fiber 1623. If you have any questions, please contact Stephanie Lowenthal at (646) 441-5220.

Photos:

To obtain a hi-resolution photograph of the Market Open, please go to http://www.nasdaq.com/reference/marketsite_events.stm and click on the market open of your choice.

About Internet Security Systems Inc. (ISSX):

Internet Security Systems, Inc. (ISS) is the trusted security advisor to thousands of the world's leading businesses and governments, providing preemptive protection for networks, desktops and servers. An established leader in security since 1994, the ISS Proventia(r) integrated security platform automatically protects against both known and unknown threats, keeping networks up and running and shielding customers from online attacks before they impact business assets. ISS products and services are based on the proactive security intelligence of its X-Force(r) research and development team - the unequivocal world authority in vulnerability and threat research. The ISS product line is also complemented by comprehensive Managed Security Services and Professional Security Services. For more information, visit the Internet Security Systems Web site at www.iss.net or call 800-776-2362.

Internet Security Systems is a trademark and Proventia and X-Force are registered trademarks of Internet Security Systems, Inc. All other companies and products mentioned are trademarks and property of their respective owners.

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