Unlike the cluster which uses fail2ban to block ip addresses, if a user is prevented from connecting to star server
the process is a little different.

`star-server` uses the `denyhosts` service which adds the ip address to the file: `/etc/hosts.deny`

However simply removing the ip address from this file is not sufficient. Firstly the denyhosts service has to be stopped by the following command:

`$ systemctl stop denyhosts.sevice`

Then the ip address has to be removed from the following files:

`/etc/hosts.deny`
`/var/lib/denyhosts/hosts`
`/var/lib/denyhosts/hosts-restricted`
`/var/lib/denyhosts/hosts-root`
`/var/lib/denyhosts/hosts-valid`
`/var/lib/denyhosts/users-hosts`

The denyhosts service can then be restarted with:

`$ systemctl start denyhosts.sevice`