When I did the installation of 1.4.4.5 in the setup page I got the warning that security of my log files are not safe. Log has 0660 and should be 0600. Where can I change this to 0600?

Via FTP

Already looked via FTP in zp-data and security.log and security_log.txt have 0600. Don't understand why I got the warning in setup that it was in 0660 and couldn't be changed to 0600. Only file in 0660 is "zenphoto.cfg". Should I change it in 0600 or not?
Thanks

Yes, change it. Sometimes Zenphoto's setup is not allowed to do what it wants to do by the servers.