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February 6, 2014

Frustrate SSH Scanners with Iptables GeoIP Blocking

Updated 2018:  Still working! xt_geoip_dl is now available and handles Geolite2 database downloading, simplifying our script. In the rare situation that we need to run a system that has SSH exposed to the world, we always install something to monitor and block SSH attempts. On the low end, we use fail2ban or sshguard, but our […]

December 14, 2013

Disqus WordPress Import Hangs

We recently needed to migrate a large WordPress site’s comments to Disqus. Disqus offers two methods of importing comments: their plugin “export” function and a WXR import function. Unfortunately, neither worked for us.  The WXR import process is horrible; if it fails processing it simply says “Error parsing import” instead of returning any useful information.   […]

July 21, 2013

Enable Elliptical Curve Diffie-Hellman (ECDHE) in Linux

With all the recent publicity regarding Internet spying, there has been a renewed interest in security and encryption. One oft-neglected feature of SSL is the ability to use a cipher with Diffie-Hellman key exchange that enables so-called perfect forward secrecy. The advantage of PFS is that even if your private key is compromised, recorded past […]

March 21, 2012

IPSEC VPN Between Amazon VPCs

This is the world’s only existing simple example of an Openswan / Libreswan VPN between two Amazon EC2 VPCs. At least it seems that way after many fruitless searches today. We recently needed to link a client’s two VPCs together using a VPN and decided to use Libreswan instead of OpenVPN. Since there’s a dearth […]

March 4, 2012

Magento: Remove Search Results From Search Engines

Having your site’s search results indexed is a bad SEO practice. Here’s another simple Magento fix that I didn’t find clearly documented elsewhere. In fact, I found broken plugins that purport to accomplish this for you. In your local.xml, simply add the following to your section: NOINDEX,FOLLOW NOINDEX,FOLLOW

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