I have an old site that is in danger of being compromised as many of the directories and files have permissions set to 777. However, when I try to change them to 555 via FileZilla I get the error
500 'SITE CHMOD 555 filename': command not understood
Googling it only reveals issues relevant to connecting to the server, but I can do that, as well as up and downloading files. I'm not sure what this means exactly. Is it that my account doesn't have sufficient permissions to make these changes?