On Wednesday, Sun Microsystems acknowledged that its Grid, a computing service available to the public, was the victim of a denial-of-service (DoS) attack on its opening day, CNET News.com reports.Sun decided to open up a text-to-speech translation service to the public to let users test out the Sun Grid, according to CNET. The service could be used to turn a written article into a podcast, for instance, CNET reports.Aisling MacRunnels, senior director of utility computing for Sun, told CNET that the service quickly became the target of a DoS attack and was shut down.A DoS attack is executed when a perpetrator sends numerous requests for information to a targeted computer system using an invalid IP return address. When that system\u2019s server attempts to confirm the request, it gets no response because of the false return address. The system then continues to generate confirmation requests until it is overloaded and shuts down.Sun had little trouble handling the issue once its text-to-speech service was taken down, according to CNET. The company simply shifted the service into the regular Sun Grid, which requires authorization, CNET reports.\u201cThere was no degradation to performance for users inside the Sun Grid,\u201d Brett Smith, a Sun spokesman, told CNET.Users must agree to Sun\u2019s legal policies and export controls regulations, as well as provide e-mail addresses to be authorized to access the Sun Grid, CNET reports. Payment for the service requires a Sun-approved mechanism\u2014PayPal, for instance\u2014and users of those services must be verified, according to CNET.\u201cThat gives us a level of knowledge about the user,\u201d MacRunnels told CNET. \u201cThey have to have a bank account on file with PayPal and a home address. Those make us feel more comfortable.\u201dFor related CSO content, check out How a Bookmaker and a Whiz Kid Took on an Extortionist\u2014and Won.For related news coverage, read Security Experts Warn of \u2018Distributed Reflected DoS\u2019 Attacks.Keep checking in at our CSO Security Feed page for updated news coverage.