Chris Lamprecht, better known to the hacker world as 'Minor Threat,' got a rude awakening when he appeared in court on February 26. Lamprecht, who has been in prison for four years, appeared in court to argue that the government had breached its 1995 plea agreement which led to his initial sentencing. What he wasn't prepared for was a government response to a second brief he had filed, challenging the conditions of his supervised release.   As a result of his initial sentencing, Lamprecht will have as a condition of his supervised release a restriction that prohibits him from 'utilizing any computer network,' including the Internet, effectively making him the first person to be banned from the Internet.   In a brief filed the day before the hearing, the prosecutors responded to Lamprecht's motion to have those restrictions lessened. The tactic caught Lamprecht and his attorney, Robert Kuhn, off guard. 'We were ambushed,' Lamprecht said, 'we had no notification and we were not ready to rebut their claims.'   At the heart of the matter are Lamprecht's First Amendment rights.   Lamprecht's mother, Michele Wood, has been maintaining a Web page providing information about her son's case and informing people about his 'Internet ban.' The Web page, however, provoked last month's controversy.   'They talked about me having a Web page like it was a horrible thing,' Lamprecht said.   Upon recommendation of his attorney, Lamprecht has decided to have the Web page taken down. 'I guess the government has silenced me,' he said, 'I didn't think that this is how the First Amendment was supposed to work.'   Prosecutors see things differently, in large part stemming from an earlier incident in which the underground hacker journal Phrack had published the name and social security number of an IRS agent who had testified against Lamprecht. According to prosecutors, the agent suffered numerous incidents of harassment, including having his credit rating ruined. Lamprecht commented that 'publishing his name in Phrack was the wrong thing to do,' but he doesn't believe that it justifies an Internet ban. 'If Phrack had been mailed, would they have banned me from using the mail? Of course not.' The incident has left federal judge Sam Sparks and U.S. attorneys concerned about similar retaliations.   Prosecutors accused Lamprecht of running his Web page from prison, a claim that he emphatically denies. The page, he says, was run and maintained by his mother for the sole purpose of educating people about his case. Indeed, the Web page has generated media attention about Lamprecht's Internet ban, prompting several news stories and television interviews with the jailed hacker.   Because of the last minute nature of the government's filing, Lamprecht was not able to produce any witnesses on his own behalf, nor was he able to testify, citing threats from prosecutors that he would be examined about alleged crimes not covered under his plea agreement if he were to take the stand on his own behalf.   U.S. Attorney Robert Pitman, the government prosecutor handling the case, was unable to comment, describing it as a 'matter which is still pending.'   Although the court did not demand that Lamprecht remove his Web page, Lamprecht felt pressured. 'I finally decided to take the page down, so I might be able to have a chance of using the Net when I get out next year.'   Overall, Lamprecht's concerns are practical ones. When he is released from prison next year, he plans to continue his studies at the University of Texas where he is majoring in computer science. The Internet ban, he fears, will make completing his degree impossible.   Lamprecht's case continues and this month, he won back his right to direct appeal, something he had given up as a condition of his initial plea bargain.   'I'm still going to fight like hell,' said Lamprecht regarding the Internet ban. 'I'll just have to do it without a Web page.'