I’ve come across an odd problem today on a server that’s been working fine for all kinds of FTP traffic for many years. Turns out that today, FileZilla started complaining about explicit TLS...
Learn MoreThere are two funky commands that can help us see who’s currently logged in, and what operations were performed last. Those two commands are who and last. Let me show you how to use them. The who...
Learn MoreToday I was introduced to something called the CBL, or the Composite Blocking List. This is one of several Spamhaus projects that’s there to make sure IP’s are blacklisted when they’re...
Learn MoreCentOS 7 has a nice command called hostnamectl. With it we can display the current hostname, and set any of the three types of hostname: static hostname (something like example.com) transient hostname...
Learn MoreHere’s how to do it: firewall-cmd --zone=internal --add-service=ssh --permanent firewall-cmd --zone=internal --add-source=1.2.3.4/32 --permanent firewall-cmd --zone=internal --add-source=5.6.7.8/32...
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