authz_host is an Apache module used to restrict access based on the client’s IP address or hostname. Order Allow,Deny and Order Deny,Allow are two of its directives that determine how the following Allow from and Deny from statements are interpreted. This post hopes to explain in simple terms how to use these properly.
HostNameLookups is where Apache does a reverse DNS lookup for every connecting client’s IP address. In addition to on and off there is also a double option that does a reverse lookup followed by a forward one to see if the host name matches the IP address.
I recently noticed something weird in my Apache access log files. There were entries like this: abdussamad.com:80 localhost – – [09/May/2013:14:26:47 +0500] "POST /wp-login.php HTTP/1.0" 200 3784 "abdussamad.com/wp-login.php" "Mozilla/5.0 (Windows NT 6.1; rv:19.0) Gecko/20100101 Firefox/19.0"abdussamad.com:80 localhost – – [09/May/2013:14:26:47 +0500] "POST /wp-login.php HTTP/1.0" 200 3784 "abdussamad.com/wp-login.php" "Mozilla/5.0 (Windows NT 6.1; rv:19.0) Gecko/20100101 Firefox/19.0" Now the […]
The Apache expires module, also known as mod_expires, allows you to fine tune “Expires” and “Cache-Control” HTTP headers sent with files served by Apache. These HTTP headers provide information for browsers and caching proxy servers on how long to cache content served by Apache.
Apache web server has a configuration option called MaxClients. MaxClients determines the maximum number of concurrent connections that Apache will service.