Sorted:

Apache showing “Python version mismatch” with mod_wsgi-Collection of common programming errors

SSH login via IPv6 successfull while using IPv4 to the same host yields “Permission denied”-Collection of common programming errors

More than half of the memory in use right after rebooting-Collection of common programming errors

IPv6 routing setup (using native IPv6)-Collection of common programming errors

How to store IPv6-compatible address in a relational database-Collection of common programming errors

Facebook php example: Fatal error-Collection of common programming errors

Fatal error: Call to undefined method Facebook::require_login()-Collection of common programming errors

Android Raspberry pi W/System.err(13264): java.net.ConnectException connection refused-Collection of common programming errors

undefined symbol: __gmp_get_memory_functions-Collection of common programming errors

IPv6 and its various incarnations-Collection of common programming errors