I have installed Discourse on my server, and it has ran a long good time, without any troubles.
However after the latest update, I have found that all of the user accounts are failed to login, including admin ones.
After awhile I was suspecting it is a plugin issue, therefore I removed all the plugins then ran
./launcher rebuild app to have it run pure vanilla version, but no cigar to that. For the current situation, it seems like our site is read only and cannot do any action other than reading threads.
Upon any login form submission, it shows this and we have no idea what this means.
Site is located at https://discuss.stickyricelove.com and we are a Non-Profit educating and promoting SexEd in Hong Kong, for teenagers and resolving their wonder and doubts.
Very looking forward to an answer soooooooooooooooooooooon.