Hi My Server use CentOS and I have installed mod_qos like this. #cd mod_qos-8.18/apache2/ #apxs -i -c mod_qos.c Then it show statement below ,so it seem libraries installed already . -------------------------------------------- Libraries have been installed in: /usr/lib/apache If you ever happen to want to link against installed libraries in a given directory, LIBDIR, you must either use libtool, and specify the full pathname of the library, or use the `-LLIBDIR' flag during linking and do at least one of the following: - add LIBDIR to the `LD_LIBRARY_PATH' environment variable during execution - add LIBDIR to the `LD_RUN_PATH' environment variable during linking - use the `-Wl,--rpath -Wl,LIBDIR' linker flag - have your system administrator add LIBDIR to `/etc/ld.so.conf' See any operating system documentation about shared libraries for more information, such as the ld(1) and ld.so( manual pages. -------- #chmod 755 /usr/lib/apache/mod_qos.so #cd etc/httpd/conf #nano qos.conf My qos.conf ## QoS Settings <IfModule mod_qos.c> QS_ClientEntries 100000 QS_SrvMaxConnPerIP 20 MaxClients 256 QS_SrvMaxConnClose 180 QS_SrvMinDataRate 150 1200 </IfModule> I add statement below to my httpd.conf > LoadModule qos_module /usr/lib/apache/mod_qos.so and include qos.conf > Include “/etc/httpd/conf/qos.conf” Now i restart apache service httpd restart but when i restart apache I 'm not able to get the server-status by http://serverip/server-status It show error Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, webmaster@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. Apache Server at xxx.xxx.xxx.xxx Port 80 www.aaaa.com:80 (virtual) uses base server settings www.ccccc.com:80 (virtual) uses base server settings www.bbbb.com:80 (virtual) uses base server settings www.ddddd.com:80 (virtual) uses base server settings -------------------------------------------- In apache error log show >mod_qos(045): access denied, invalid request line: can't parse uri Normally I can use server-status<mod_status> to show detail about request to apache but when I load module modqos in my httpd.conf it has internal server error. I think it has problem in qos.conf but when coment # Include “/etc/httpd/conf/qos.conf” It remain internal server error. Some one can help me pls.