I'm setting up postgresql. I succeded in accessing as "postgres" user. I made a new user and tried to access with that one, but no matter how I do things,

"psql: FATAL: IDENT authentication failed for user <username>"

pops up. What's causing this error and how do I fix it? I've tried with a user without password, with password and you name it. My data/pg_hba.conf looks like this:

host all all 129.240.184.16 255.255.254.0 md5
local all all ident sameuser

i've looked around and seen that many others have this same problem, but I haven't found an answer that solves my problem. Please help!