Dear Maintainer, The PORT_WHITELIST option related to the hidden_ports test seems to fail when an executable path name is specified. The documentation mentions the ability to filter by executable. I used the proposed sample option from the configuration file which fails with the following error: Invalid entry specified in PORT_WHITELIST configuration option: /home/user1/abc Invalid entry specified in PORT_WHITELIST configuration option: /opt/xyz Please note that the issue occurs as well with a valid executable: # rkhunter --enable-tests hidden_ports Invalid entry specified in PORT_WHITELIST configuration option: /bin/ls