Many older threads told me to only use Bitcoin Core 0.19.1
I am starting it with

./bitcoin-qt --server

my bitcoin.conf looks like this:

daemon=1
server=1
rpcuser=(username)
rpcpassword=(password)
rpcallowip=127.0.0.1
prcport=(port)

I tried many different ports and many different username/password combinations.
I once tried running it via

bitcoind --server

which responded with "wrong password" in the log window when I start cgminer with the correct rpc user/pass.

 
I start cgminer like this:
sudo ./cgminer -o http://127.0.0.1:(port) -u (username) -p (password) --btc-address (address)


What am I doing wrong? Thanks in advance for every kind help I can get!