Category Archives: Security

Linux : OpenVPN error can’t find module ‘pyovpn’ after upgrading Debian 10 to 11

If you were running OpenVPN 2.x on Debian 10 successfully and it suddently broke with the following error after upgrading to Debian 11 : Oct 21 11:34:12 ovpnserver openvpnas[32211]: Traceback (most recent call last): Oct 21 11:34:12 ovpnserver openvpnas[32211]: File “<string>”, line 1, in <module> Oct 21 11:34:12 ovpnserver openvpnas[32211]: File “<frozen zipimport>”, line 241,… Read More »

Linux : cPanel Exim service keep bouncing up/down

If you are receiving a lot of cPanel notification message stating that the Exim mail server service is flapping (going down and up repeatedly) as followed : The service “exim-26,465,587” appears to be down. The service “exim-26,465,587” is now operational. You are most likely victim of some sort of denial of service attack against your… Read More »

Linux : OSSEC WebUI not showing information after PHP upgrade

You may have noticed that the OSSEC Web Interface stopped working (as of today on a new installation) or after updating PHP on your server. Looking at the logs, you most likely found a similar entry: PHP Fatal error: Uncaught Error: Call to undefined function split() in /var/www/html/ossec/lib/os_lib_agent.php:111\nStack trace:\n#0 /var/www/html/ossec/site/main.php(33): os_getagents(Array)\n#1 /var/www/html/ossec/index.php(126): include(‘/var/www/html/o…’)\n#2 {main}\n thrown… Read More »

PanOS : Failed to load into software manager

The following error message may happen from time to time when attempting to load new software version in Palo Alto Firewall or Panorama : Successfully downloaded Preloading into software manager Error: Image File Authentication Error Failed to load into software manager. Please retry. Post processing failed. Please retry PanOS always do software image integrity check… Read More »

Linux : How to change the OpenVPN lockout time policy

By default, OpenVPN has 15 minutes timeout lockout policy for consecutive unsuccessful authentication attempt (whatever you are using Local, PAM or LDAP authentication). If you want to change it to shorter or longer time period, follow these easy steps below : 1. Push the new timeout value to the configuration using this command (this example… Read More »

JunOS : Port forwarding on Juniper SRX

A friend of mine who was used to the legacy and EOL SSG/ScreenOS platform and he just jumped into the new world of SRX/JunOS gave me the motivation to write this article. As the syntax is quite different between the two platform, it may be harder to get at first and the following example should… Read More »