Internet Security Systems and Crossbeam Systems Team Up to Offer Network Intrusion Prevention for World's Largest Networks; ISS

Internet Security Systems, Inc. (ISS) (NASDAQ: ISSX),
the worldwide leader in preemptive, enterprise security, and Crossbeam
Systems, the leader in unified threat management (UTM) for the world's
largest networks, today announced an alliance to deliver
industry-leading intrusion prevention on high-performance security
switches. Through this alliance, Crossbeam will incorporate ISS
Proventia(R) Network Intrusion Prevention System (IPS) technology into
its high-end UTM platforms to accommodate enterprise needs for fast,
highly scalable security solutions.
   "The alliance with Crossbeam is a key extension of our 'Powered By
ISS' program and a direct response to market demand," said Tom Noonan,
president and CEO of Internet Security Systems. "ISS introduced the
program in May of this year to enable increased flexibility and
scalability in delivering best-of-breed security technologies to the
mainstream market. Through 'Powered By ISS,' we are supplying service
and technology providers with the full range of ISS tools, processes,
intelligence and support needed to protect customers from Internet
threats. Crossbeam is highly regarded in the carrier and service
provider markets and this alliance will strengthen ISS' position in
these key growth areas."
   "Carrier and service provider organizations are increasingly
embracing the flexibility and simplicity that a high-end UTM solution
offers," said Peter George, president and CEO of Crossbeam Systems.
"These organizations demand best-of breed security applications
running on high-performance, purpose-built network security hardware.
Proventia Network IPS running on Crossbeam will enable both Crossbeam
and ISS to further penetrate the service provider and carrier
markets."
   Crossbeam offers both enterprise-class and provider-class UTM
solutions. Recently, ISS has seen an increased demand among
telecommunications carriers and other service providers to deliver
centralized security to their end users as a market differentiator or
as a new revenue opportunity. Through the Crossbeam alliance and other
similar agreements, ISS will increasingly meet the needs of carriers
and service providers via the "Powered By ISS" program.
   The "Powered By ISS" program is intended to extend the reach of
ISS preemptive security to a much broader market, allowing
participants to quickly and effectively meet customers' security and
regulatory compliance needs. Due to the versatility and open
architecture of the ISS protection platform, ISS has the ability to
provide the security backbone for a wide variety of organizations.
   ISS Proventia Network IPS protects against both vulnerabilities
and exploits to effectively block known and unknown attacks before
impact, enabling organizations to prevent costly security breaches,
improve network availability and achieve regulatory compliance.
Through its proprietary Virtual Patch(R) technology, ISS protects
organizations from online attacks before they are able to obtain and
apply patches from affected vendors, in many cases translating into
protection from software flaws months before the affected vendor is
able to release a patch.
   Crossbeam UTM solutions couple best-in-class security applications
with high-performance, purpose-built network security hardware. The
end result is massive appliance consolidation, eliminating up to 100
separate devices per Crossbeam security switch, and the ability to
build defense in depth infrastructures at a reasonable cost.
   The ISS Proventia Network Intrusion Prevention System for
Crossbeam will be available to select customers beginning this
quarter. For further details, please visit Interop Booth #145 or go
to: www.iss.net/2006/interopny.

   About Crossbeam

   Crossbeam Systems secures the world's largest networks with its
pioneering best-of-breed Unified Threat Management (UTM) solutions.
The company has tailored security solutions for global corporations,
carrier networks and small to medium-sized enterprises. Founded in
early 2000 and led by senior executives from Bay Networks, Cisco,
Nortel/Wellfleet and Alcatel, Crossbeam is headquartered in
Boxborough, Massachusetts, USA, and has offices in Europe and Asia
Pacific. The company is backed by top-tier investors, including Focus
Ventures, Tudor Ventures, Matrix Partners, North Bridge Venture
Partners, Commonwealth Capital Venture Partners, Intel Capital and
Charles River Ventures. More information is available at
www.crossbeamsystems.com.

   About Internet Security Systems, Inc.

   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.

   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.
Some of these forward-looking statements include those describing
future ISS and Crossbeam solutions not yet released. 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 ISS products;
product and price competition; the extent to which unauthorized access
to and use of online information is perceived as a threat to network
security; customer budgets; risks concerning the rapid change of
technology; and general economic factors. These risks and others are
discussed in ISS' 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 is a trademark and Proventia, Virtual
Patch 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.