Cntlm installed on RHEL 7 and started, but it doesn't seem to listen

Question

I have Cntlm installed on RHEL 7.9 from an .rpm file. After configuring it I tried it out with:

curl --proxy http://127.0.0.1:3128 http://google.com

and I get the error "curl: (7) Failed connect to 127.0.0.1:3128; Connection refused" back.

How can I trouble shoot and fix this?

Here the details how I configured Cntlm:

1. I configured /etc/cntlm.conf with the hash I got from cntlm -H.
2. Then I checked the outgoing proxy with cntlm -M http://google.com and I got an OK.
3. I finally started the daemon with sudo service cntlmd start
4. And checked the status with sudo service cntlmd start which returned "Active: active (exited) since..."

it cli tool cntlm is working (I can create