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The UA was working Thursday to clean up one of two computer servers that were compromised when hackers broke in and redirected Web pages to pornography sites, officials said.

The University of Arizona was made aware of the situation Wednesday when it was told the philosophy department's Web site and one belonging to the Large Binocular Telescope Observatory had pornographic material placed on the servers, said Michael Torregrossa, director of the Center for Computer and Information Technology's computing services.

Torregrossa said it appeared that someone from outside of the country broke into the system through a vulnerable program called Twiki, which is used for collaborative purposes.

The university learned recently that the software was vulnerable but hadn't had the chance to fix it and secure the servers, he said.

"Our central information technology group was made aware of the situation, and both sites were shut down almost as soon as we heard of it," Torregrossa said.

The hackers made it so that whenever people clicked on a link, they would be redirected from the legitimate site to one displaying pornography, he said.

As of Thursday afternoon, the philosophy department's server still was down, he said.

This kind of intrusion is becoming more and more common at other universities and organizations.

"Whether you have a workstation computer, a desktop or laptop, it is important that you keep the software patched up and up to date," Torregrossa said. "You have to password-protect everything you can, because there are lots of Internet bad guys looking for machines to break in to."