To remove a block:
- ssh to the machine that has blocked the user.
- If you need to, you can search the firewall for just that IP address with:
sudo /sbin/iptables --list --numeric --verbose | /bin/grep ipaddr, e.g.
sudo /sbin/iptables --list --numeric --verbose | /bin/grep 188.8.131.52
- When you have decided that the address is indeed blocked by the firewall,
run the following command:
sudo /sbin/iptables --delete rule -s ipaddr/32 -d 0/0 -j DROP, e.g.
sudo /sbin/iptables --delete UNC-ACCEPT-INPUT -s 184.108.40.206/32 -d 0/0 -j DROP
- Now search for the IP address again in UNC-ACCEPT-INPUT, in case the user
ended up in the firewall more than once. All instances of the IP address
must be removed from the UNC-ACCEPT-INPUT firewall rule.
All the best