Since Linux kernel 2.6.8 CDWserver (the server of webCDwriter) has to run with "root" privileges to enable cdrecord to burn CDs. Adjust the file /etc/CDWserver/config-root as follows:
# # After changing this file restart CDWserver by # /etc/init.d/CDWserver restart # user=root group=cdwserve
$ su $ unset SUDO_COMMAND $ /etc/init.d/CDWserver restart