Merge remote-tracking branch 'origin/pr/19'

content/docs/security/VPN.md

@@ -10,7 +10,7 @@ If you happen to be using a standard VPN system that allows authentication via X
 There is not a lot of information around setting up Security Tokens with enterprise VPN systems such as F5, but such systems are not easy to audit and should be avoided if possible.
 
 Here is a cached version of a now-deleted 2013 how-to article F5 dev blog posted on this:
-http://webcache.googleusercontent.com/search?q=cache:53KnX9k3ZpMJ:https://devcentral.f5.com/articles/two-factor-authentication-using-yubikey-yubicloud-and-big-ip-ltm%2Byubikey+f5+vpn&hl=en&ct=clnk
+https://web.archive.org/web/20171124220733/https://devcentral.f5.com/articles/two-factor-authentication-using-yubikey-yubicloud-and-big-ip-ltm
 
 There is at least one implementation of TOTP support for F5 you can roll yourself:
 https://loadbalancing.se/2016/07/09/setting-up-apm-with-google-authenticator/