Freebox Server (Ultra V9/ Pop V8/ Delta V7 / Revolution V6 / Mini 4K)

Pour information quelque soit le site de scan utiliser, le port reste toujours grand ouvert et non stealth.

est-ce vraiment gênant si rien ne répond sur ce port... ?

Le problème n'est pas que le port ne répond pas mais justement qu'il répond et ce même avec l’accès distant fermer.
Il est impossible de le fermer a cet instant.

Test de sécurité classique fait avec un ami:

Starting Nmap 6.40 ( http://nmap.org ) at 2014-02-22 09:43 Paris, Madrid
NSE: Loaded 110 scripts for scanning.
NSE: Script Pre-scanning.
Initiating Parallel DNS resolution of 1 host. at 09:43
Completed Parallel DNS resolution of 1 host. at 09:43, 0.33s elapsed

Initiating SYN Stealth Scan at 09:43

Scanning (mon IP) [1000 ports]
SYN Stealth Scan Timing: About 30.50% done; ETC: 09:45 (0:01:11 remaining)
SYN Stealth Scan Timing: About 60.45% done; ETC: 09:45 (0:00:40 remaining)
Discovered open port 85/tcp on (mon IP)
Completed SYN Stealth Scan at 09:45, 91.13s elapsed (1000 total ports)
Initiating Service scan at 09:45
Scanning 1 service (mon IP)
Completed Service scan at 09:45, 6.05s elapsed (1 service on 1 host)
Initiating OS detection (try #1) against (mon IP)
Initiating Traceroute at 09:45
Completed Traceroute at 09:45, 0.02s elapsed
Initiating Parallel DNS resolution of 5 hosts. at 09:45
Completed Parallel DNS resolution of 5 hosts. at 09:45, 0.06s elapsed

NSE: Script scanning 88.183.54.42.
Initiating NSE at 09:45
Completed NSE at 09:45, 4.46s elapsed

Nmap scan report for (mon IP)
Host is up (0.013s latency).
Not shown: 999 filtered ports

PORT STATE SERVICE VERSION
85/tcp open http nginx

Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
Device type: general purpose
Running: Linux 3.X
OS CPE: cpe:/o:linux:linux_kernel:3
OS details: Linux 3.2 - 3.6
Uptime guess: 1.095 days (since Fri Feb 21 07:29:00 2014)
Network Distance: 5 hops
TCP Sequence Prediction: Difficulty=258 (Good luck!)
IP ID Sequence Generation: All zeros

NSE: Script Post-scanning.
Read data files from: C:\Program Files (x86)\Nmap
OS and Service detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 106.09 seconds
Raw packets sent: 2053 (92.900KB) | Rcvd: 22 (3.152KB)

Il est clairement indiqué que ma box répond... on voit même le uptime depuis le dernier reboot.
Un DDoS plantera la connexion sans souci...