Internet Security Systems ( ISSX) increased third-quarter revenue by 14% and beat Wall Street's earnings expectations by 2 cents a share.ISS, a seller of Internet security products to businesses, earned a profit of $9.8 million, or 21 cents a share, compared with $6.4 million, or 14 cents a share, a year ago, the company reported after Tuesday's closing bell. Revenue was $82.8 million, a bit above the consensus of analysts polled by Thomson First Call, which was expecting sales of $82.3 million. Excluding items, the Atlanta-based company earned a profit of $10.9 million, or 23 cents a share; analysts were looking for a profit of 21 cents a share. Looking to the fourth quarter, the company now expects to earn a non-GAAP profit ranging from 25 cents to 27 cents a share on sales of $88 million. Wall Street was projecting a 24-cent profit on sales of $90.6 million. Following the announcement, shares of ISS rose 11 cents in after-hours trading to $25 on Instinet.