It doesn't work for me. There is no option to remove password from the web ui in either 1.1.82 or 1.2.82 linux x86 running on a Qnap NAS. I am not able to remove the password from either version. I've tried setting the fields to empty values ("login" : "") and removing the fields entirely. I noticed that the contents of the "webui" element in the JSON conf file cannot end with a trailing comma. If you comment the "login" and "password" lines, make sure there is no trailing comma after the preceding "listen" element. (All this should be better documented.) In any case, it doesn't work. It is not possible to remove the web ui password so this looks like a bug. Deleting settings.dat files is a non-starter because it would delete the configuration of the existing sync folders. Also, it would be good to know where the configuration values are stored in Windows.