How to block an IP address with UFW (uncomplicated firewall)
Recipe $ sudo ufw insert 1 deny from [ip-to-block] to any The 1 above shows the order of the insert. You can insert a rule
Security
How to decrypt Remmina passwords
Background This article is about decrypting Remmina passwords. Of course it’s pretty easy to Google but the problem is the very first link on Stack
How to enable TLS 1.1 and TLS 1.2 on Windows 7 and deal with Outlook encryption type errors
Basically Windows 7 is end of life 2020. Some users insist on still using it or don’t want to pay for upgrades, because actually, IT
How to install a CloudFlare origin server SSL certificate into Virtualmin
Background If your Virtualmin website is using Cloudflare as a proxy you can’t use the standard Let’s Encrypt HTTP method to request a fresh certificate.
How to deal with CSP and being contacted by a “security researcher”
Background You might be approached by someone looking for money. They will give you this information (broken English included): Summary: X-Frame-Options ALLOW-FROM https://billing.example.com/login not supported
Unable to restart FirewallD – Found left-over process 1234567 (rmmod)
To restart FirewallD, use this command: service firewalld restart However, if FirewallD refuses to restart, and you check the status using this command: service firewalld
Pentest – Penetration Testing – What is it, and what tools are involved
Penetration testing is popular to check internet exploits. Here are a number of tools and services to help with checking up your security. Here is
How to get L2TP working from the Linux command line
This article explains how to get xl2tpd, which has PPPtP cababilibies, working on Linux. This is useful where you have a server environment and you
Fail2ban stops working because FirewallD is not running
Observing the fail2ban log file shows that IPs are already banned but still appearing in the list. Closer inspection of the log file shows that
Key based authentication stops if /root permissions are incorrect
On a good server SCP was used to retrieve a remote compressed file. This was saved to the root directory. Thereafter key based authentication stopped