in the normal settings for the web interface there is a field that says
“Users (username/password on each line)”
and it seems i can not figure out how to input usernames and passwords there,
so that i can actually log in to the web interface (connecting works fine, but login is rejected.
i tried to separate usernames and passwords with / on each line (e.g. “name/password“)
i also tried to write a user on one line and the password on the other.
(i also tried some other random combinations, none seem to work)

so, how is one supposed to enter this information and is there any way
to figure out what tixati thinks the usernames and passwords are?

username/password works for me, one user in a line, like:
pete/1234

ok, thanks for confirming.
it seems that the login does not work with opera12 on win8.1 x64, at least not for me.
i thought i did try with another browser but it seems that was when something invalid was entered into the box.

so, thanks i got it to work now :)

Late reply, but you have to hit enter after the entering "user/pass"... it looks like it needs a carriage return.

Thanx for the Help :)