ISS Named One of the Top 50 Largest Pure InternetCompanies, Ranked Fastest Growing Internet...

ATLANTA--(BUSINESS WIRE)--Oct. 1, 1999--

IW 50 Recognition Further Validates ISS Leading Position as

a Key Enabler of Safe and Productive E-Business

Internet Security Systems (ISS)(Nasdaq: ISSX), the leading provider of security management solutions, has been named

one of the Top 50 Internet Companies by InternetWorld magazine. Recognizing the 50 most influential pure-play Internet companies, InternetWorld's recognition comes on the heels of the selection of ISS for USA Today's Top 50 E-business 50 Stock Index and further recognition as one of the most important business-to-business Internet companies.

Out of the few security companies included in the IW50, ISS' is the fastest growing maintaining its position for the second consecutive year on the list, with an overall growth rate from 1997 to 1998 of 152 percent. In addition, in a recent analyst report from International Data Corporation (IDC), ISS was named the number one worldwide leader in network security assessment and intrusion detection (IDnA) solutions with 43 percent total market-share, nearly double that of its nearest competitor.

"We are delighted by ISS' recent recognition as the leading provider of network security management solutions critical to e-business," said Tim McCormick, vice president of corporate marketing, ISS. "We look forward to continuing to deliver on our commitment to be our customers' trusted security partner, providing the software and services solutions our customers require to protect the availability, integrity and confidentiality of their e-business information and systems."

InternetWorld's criteria and methodology for selection to the prestigious list is based on a majority of a public company's trailing 12-month revenues coming from the Internet and a company's sales growth over the most recent 12-month period. The complete Top 50 Internet Companies list can be viewed at www.internetworldnews.com/idx_ip.asp.

About ISS

ISS is the world's leading provider of security management solutions for e-business. By offering best-of-breed SAFEsuite(R) security software, comprehensive ePatrol(TM) monitoring services and industry-leading expertise, ISS serves as its customers' trusted security provider protecting digital assets and ensuring the availability, confidentiality and integrity of computer systems and information critical to e-business success. ISS' security management solutions protect more than 5,000 customers including 21 of the 25 largest U.S. commercial banks, 9 of the 10 largest telecommunications companies and over 35 government agencies. Founded in 1994, ISS is headquartered in Atlanta, GA, with additional offices throughout North America and international operations in Asia, Australia, Europe and Latin America. For more information, visit the ISS Web site at www.iss.net or call 800-776-2362.

NOTE TO EDITORS: This release, other than historical information, includes forward-looking statements made pursuant to the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. The risks and uncertainties which could cause actual results to differ materially from those in the forward-looking statements include, but are not limited to, the following: the level of demand for the Company's products; the volume and timing of orders; product and price competition; the Company's ability to expand its domestic and international sales and marketing organizations; the Company's ability to develop new and enhanced products; the Company's ability to attract and retain key personnel; the mix of distribution channels through which the Company's products are sold; the growth in the acceptance and use of the Internet and of private Internet-protocol networks or "intranets"; the extent to which unauthorized access and use of online information is perceived as a threat to network security; customer budgets; the assertion of infringement claims with respect to the Company's intellectual property; seasonal trends in customer purchasing; foreign currency exchange rates; general economic factors; and risks concerning the rapid change of technology. These risks and others are discussed in the Company's periodic filings with the Securities and Exchange Commission. These filings can be obtained either by contacting ISS Investor Relations or through the Securities and Exchange Commission's Web site at "http://www.sec.gov".

Internet Security Systems, SAFEsuite and ePatrol are trademarks of Internet Security Systems and ISS Group, Inc.