Software development & sys admin

Category Web hosting

NMAP: check the open ports of your server

Your server has 65535 ports whatever the OS installed on your server. As a reminder, the ports are used by the TCP and UDP protocols of the transport layer of the OSI model. The nmap tool is very useful to… Continue Reading →

Linux: remove root access in ssh

The goal is to remove the exposure of our server to root access attempts via ssh. Because on the Internet, some servers used by hackers, do automatic scans and target the ssh root access. Our use of fail2ban (voir l’article)… Continue Reading →

Protect yourself from ssh intrusions with fail2ban on CentOS

By default on CentOS iptables are used as a firewall. If it is not, the following will change slightly (especially at the ‘ban action’ level). It does exist a configuration file /etc/fail2ban/jail.conf. We do not modify this one otherwise if… Continue Reading →

Onlyoffice, a self-hosted alternative to Google Docs and Microsoft Online office

You may not know this logo yet: Yet it is worth knowing. It is the best alternative to Google Docs and Microsoft Online Office. One of the very big strengths: we can host OnlyOffice ourselves. That’s precisely where its interest… Continue Reading →

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