On the web, the connexion mobile is OK.
On the SSH, the ping is OK on 188.8.131.52.
PING 184.108.40.206 (220.127.116.11): 56 data bytes
64 bytes from 18.104.22.168: seq=0 ttl=119 time=55.031 ms
64 bytes from 22.214.171.124: seq=1 ttl=119 time=48.030 ms
64 bytes from 126.96.36.199: seq=2 ttl=119 time=45.571 ms
64 bytes from 188.8.131.52: seq=3 ttl=119 time=47.019 ms
64 bytes from 184.108.40.206: seq=4 ttl=119 time=44.971 ms
64 bytes from 220.127.116.11: seq=5 ttl=119 time=44.232 ms
On the SSH, curl ou wget isn't OK :
root@XXXXXX: wget http://www.mon-ip.com/
Failed to send request: Operation not permitted
After the command /etc/init.d/firewall/restart, the command curl and wget is OK and the connection is OK.
After the restart firewall, My IP private for ISP has changed as well as IP public ISP.
This problem is random and rare (once every 10 days).
Reboot the router also fixes the problem.