Running pion library example on CentOS 7 - No response from server

So, I'm trying to run a following pion library example in order to make a simple webservice: Pion example

The code is compiled using following makefile:

CC=g++

PRE_ARGS+=-fpermissive
POST_ARGS+= -lpion -lboost_thread-mt -lssl -lcrypto

all: release

release:
        $(CC) -O0 -std=c++11 -fPIC -g -m64 $(PRE_ARGS) main.cpp -o main.a $(POST_ARGS)

It compiles OK, but when I'm trying to run it on my CentOS 7, trying to access either localhost:12345/ or 127.0.0.1:12345/ or by my pc's ip addr: 10.102.102.1:12345/, the browser (using firefox 31.3.0) will do nothing, but try to load the page, with 'waiting for 10.102.102.1' message in the bottom bar.

The moment i kill the server by Ctrl+C, browser immediately stops trying to load the page, and puts the following error:

The connection to the server was reset while the page was loading.

If I'm trying to get it using curl, the same happens: curl just waits, and when I kill the server, curl returns with 'Connection reset by peer' error.

I'm kinda stumped. I've flushed iptables -F to check if it was the firewall, nothing. I've turned off proxy (as I have to use proxy in my job), still the same. Anybody can please help me?