서버에 phpinfo를 찍어보니 memcached 가 로드 되어 있길래 켜 봤다너...
다른 분들과 마찬가지로 관리자 로그인이 안되더라구요 =ㅁ= ;
기존 로그인 세션이 풀려버리는 건지 동일한 페이지에서 config.php 파일을 수정해보면
다시 로그인 상태가 되네요 ㅋ

에러 메세지가

Memcache::connect() [memcache.connect]: php_network_getaddresses: getaddrinfo failed: Name or service not known(2)
File: /home/mulder21c/www/library/preprocessor.php:128
Memcache::connect() [memcache.connect]: Server localhost (tcp 11211) failed with: php_network_getaddresses: getaddrinfo failed: Name or service not known (0)(8)
File: /home/mulder21c/www/library/preprocessor.php:128
Memcache::connect() [memcache.connect]: Can't connect to localhost:11211, php_network_getaddresses: getaddrinfo failed: Name or service not known (0)(2)
File: /home/mulder21c/www/library/preprocessor.php:128

Memcache::connect() [memcache.connect]: php_network_getaddresses: getaddrinfo failed: Name or service not known(2)
File: /home/mulder21c/www/framework/cache/Memcache.php:21
Memcache::connect() [memcache.connect]: Server localhost (tcp 11211) failed with: php_network_getaddresses: getaddrinfo failed: Name or service not known (0)(8)
File: /home/mulder21c/www/framework/cache/Memcache.php:21
Memcache::connect() [memcache.connect]: Can't connect to localhost:11211, php_network_getaddresses: getaddrinfo failed: Name or service not known (0)(2)
File: /home/mulder21c/www/framework/cache/Memcache.php:21
Memcache::get() [memcache.get]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/cache/Memcache.php:98
Memcache::set() [memcache.set]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/cache/Memcache.php:101
Memcache::get() [memcache.get]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/cache/Memcache.php:42

Memcache::get() [memcache.get]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/legacy/Textcube.Control.Session.Memcached.php:101
Memcache::get() [memcache.get]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/legacy/Textcube.Control.Session.Memcached.php:63
Memcache::get() [memcache.get]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/legacy/Textcube.Control.Session.Memcached.php:63
Memcache::set() [memcache.set]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/legacy/Textcube.Control.Session.Memcached.php:73
Memcache::get() [memcache.get]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/legacy/Textcube.Control.Session.Memcached.php:63
Memcache::set() [memcache.set]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/legacy/Textcube.Control.Session.Memcached.php:73
Memcache::get() [memcache.get]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/legacy/Textcube.Control.Session.Memcached.php:63
Memcache::set() [memcache.set]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/legacy/Textcube.Control.Session.Memcached.php:73
Memcache::get() [memcache.get]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/legacy/Textcube.Control.Session.Memcached.php:42

Memcache::get() [memcache.get]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/cache/Memcache.php:98
Memcache::set() [memcache.set]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/cache/Memcache.php:101
Memcache::set() [memcache.set]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/cache/Memcache.php:35

Current Database Management System :
MySQL
Cache system :
Page cache Enabled
Skin cache Enabled
Memcached module Enabled
Memcache::set() [memcache.set]: No servers added to memcache connection(2)
File: /home/mulder21c/www/framework/legacy/Textcube.Control.Session.Memcached.php:48

요렇게 나왔거든요  ㅎㄷㄷ ;;;

무슨 문제일까요...??? ;;

phpinfo 상에서는

http://www.mulder21c.com/phpinfo.php#module_memcache
에서 보듯 default 포트로 열려 있는듯 한데...