problem installin pear

Hi. I'm trying to install PEAR but I have problems with some packages, specially with Console_Getopt. And then I'm not able to run the pear install command to install packages I need. Below I copy the errors during the installation process: Thanks in advance to anyone who can help me. Regards. Preparing installer.................. Updating channel "pear.php.net" Cannot retrieve channel.xml for channel "pear.php.net" (Connection to `pear.php.net:80' failed: ) Updating channel "pecl.php.net" Cannot retrieve channel.xml for channel "pecl.php.net" (Connection to `pecl.php.net:80' failed: ) Installing selected packages.................. Package: PEAR-stable.............................. already installed ... ok Package: Structures_Graph-stable.................. already installed ... ok Downloading and installing package: Archive_Tar-stable.......No releases available for package "pear.php.net/Archive_Tar" Cannot initialize 'channel://pear.php.net/Archive_Tar-stable', invalid or missing package file Package "channel://pear.php.net/Archive_Tar-stable" is not valid Downloading and installing package: Console_Getopt-stable.......No releases available for package "pear.php.net/Console_Getopt" Cannot initialize 'channel://pear.php.net/Console_Getopt-stable', invalid or missing package file Package "channel://pear.php.net/Console_Getopt-stable" is not valid Downloading and installing package: PEAR_Frontend_Web-beta.......No releases available for package "pear.php.net/PEAR_Frontend_Web" Cannot initialize 'channel://pear.php.net/PEAR_Frontend_Web-beta', invalid or missing package file Package "channel://pear.php.net/PEAR_Frontend_Web-beta" is not valid