Httpd – can’t access apache via custom port

I have configured apache to Listen on the port 80 and 4986

I can access it on virtualhost on port 80
but can't access it on port 4986

I have tried lsof -i:4986 :

apache2 26669 www-data    6u  IPv6 46697578      0t0  TCP *:4986 (LISTEN)
apache2 26670 www-data    6u  IPv6 46697578      0t0  TCP *:4986 (LISTEN)
apache2 26739 www-data    6u  IPv6 46697578      0t0  TCP *:4986 (LISTEN)
apache2 26741 www-data    6u  IPv6 46697578      0t0  TCP *:4986 (LISTEN)
apache2 26742 www-data    6u  IPv6 46697578      0t0  TCP *:4986 (LISTEN)
apache2 26837 www-data    6u  IPv6 46697578      0t0  TCP *:4986 (LISTEN)
apache2 26939 www-data    6u  IPv6 46697578      0t0  TCP *:4986 (LISTEN)
apache2 26940 www-data    6u  IPv6 46697578      0t0  TCP *:4986 (LISTEN)
apache2 26941 www-data    6u  IPv6 46697578      0t0  TCP *:4986 (LISTEN)
apache2 26952 www-data    6u  IPv6 46697578      0t0  TCP *:4986 (LISTEN)

the port is listened

but when I'm trying nmap -v -A localhost

Scanning localhost (127.0.0.1) [1000 ports]
Discovered open port 110/tcp on 127.0.0.1
Discovered open port 143/tcp on 127.0.0.1
Discovered open port 993/tcp on 127.0.0.1
Discovered open port 53/tcp on 127.0.0.1
Discovered open port 80/tcp on 127.0.0.1
Discovered open port 995/tcp on 127.0.0.1
Discovered open port 25/tcp on 127.0.0.1
Discovered open port 22/tcp on 127.0.0.1
Discovered open port 1723/tcp on 127.0.0.1
Discovered open port 21/tcp on 127.0.0.1
Discovered open port 10000/tcp on 127.0.0.1
Discovered open port 9091/tcp on 127.0.0.1
Discovered open port 6502/tcp on 127.0.0.1
Discovered open port 6969/tcp on 127.0.0.1
Discovered open port 8333/tcp on 127.0.0.1

the port isn't discovered

I have also to add this on my iptables :

iptables -t filter -A INPUT -p tcp --dport 4986 -j ACCEPT
iptables -t filter -A INPUT -p udp --dport 4986 -j ACCEPT
iptables -t filter -A OUTPUT -p tcp --dport 4986 -j ACCEPT
iptables -t filter -A OUTPUT -p udp --dport 4986 -j ACCEPT

but not working

any idea of what is going wrong ?