Martin Klier


Apache 2.2 – “unable to include potential exec”

Hi, recently I’ve seen ugly error pages (e.g.for 404 or 403) on my Apache 2.2 server: The supplemental text blocks have been there, but instead of header, footer and spaces “[an error occured while processing this directive]” was shown. For these accesses, the Apache error.log showed “unable to include potential exec ‘include/top.html’ in parsed file […]

read more

Prepare IPtables for the Cisco VPN Client

Hi out there, installing the Cisco VPN Client 4.8.00 should be no problem (just run “vpninstall” with kernel headers installed). But running it from the notebook in an insecure environment needs a host firewall on the mobile device. I love setting the default policies of a chain to “DROP”! But the VPN Client communicates via […]

read more

How to create a self-signed OpenSSL certificate

Hi folx, if you want to create a self-signed certificate with OpenSSL (useful for encryption-only purposes, e.g. your own mailserver) just do the following: openssl req -x509 -nodes -days 365 -subj ‘/C=DE/ST=Bayern/L=Munich/CN=www.example.com’ -newkey rsa:2048 -keyout key4cert.pem -out cert.pem It means: “-nodes” makes the key unencrypted “-days” makes it valid for n days “-subj” provides your […]

read more