Author: nsc

Getting rid of “kernel:nf_ct_ftp” messages

Sometimes firewall drops nf_ct_ftp messages to console and disturbs the work during increased amount of traffic to FTP [...]

The service ‘freshclam’ on server is currently down (Debian 8)

If You are getting mails from DA about: [crayon-588098e317f3d326038019/] [...]


1. What is Yubikey? A YubiKey is a small hardware device that offers two-factor authentication with a simple touch of a button. YubiKeys are built strong [...]

WordPress visual html editor missing (only Text mode)

It was a pitty, when richer text format was required, but none of the features were visible. And when installing MCEtiny, CKeditor and other plugins didn't [...]

“bash: scp: command not found” despite it exists

If You receive the error something like, despite the scp exist: [crayon-588098e3181ba236604906/] It may look silly, but please check if the destination [...]

git error “server certificate verification failed”

I've got this message on Ubuntu 12.04. Other servers seemed to work fine. [crayon-588098e3183ab596710557/] The fix: Append CA root of that cert to file: [...]

Cracking the RSA keys (Part 2 – generating the private key)

Previous part: Part 1 - Cracking the RSA keys (Part 1 - getting the private exponent) PART 2 For a private key generation, we need to create an [...]