After an hour of troubleshooting I finally found where I was having trouble with the Minilogin. I remembered back with EqEmu I could not have complex password in the Minilogin config.ini. Our MiniLogin appears to be the same. Lets say my password was something like this....

#@!Rt1823

Which is not my password, but mine does start with symbols and has upper, lower, numbers, etc. I had to change it to something without symbols and it finally took.

Not sure this is true with your password, but any line that starts with a # is considered a comment. Any other symbol *should* work though?

I can tell you that password starts with an !