Title: Memcached Not Working Last modified: October 31, 2022 --- # Memcached Not Working * Resolved [dragonsway76](https://wordpress.org/support/users/dragonsway76/) * (@dragonsway76) * [3 years, 7 months ago](https://wordpress.org/support/topic/memcached-working/) * I have this error in my dashboard: * > The following memcached servers are not responding or not running: > Database Cache: 127.0.0.1:11211. > This message will automatically disappear > once the issue is resolved. * I can connect to Memcache with username and password using * `memcstat --servers="127.0.0.1" --username=guy --password=your_password` * the memcache/memcached php extensions are installed: * > `memcached support => enabled > Version => 3.2.0 libmemcached version => 1.0.18 > SASL support => yes Session support => yes igbinary support => yes json support > => yes msgpack support => yes > Directive => Local Value => Master Value > memcached.sess_locking => On => On > memcached.sess_lock_wait_min => 150 => 150 memcached.sess_lock_wait_max => > 150 => 150 memcached.sess_lock_retries => 5 => 5 memcached.sess_lock_expire > => 0 => 0 memcached.sess_binary_protocol => On => On memcached.sess_consistent_hash > => On => On memcached.sess_consistent_hash_type => ketama => ketama memcached. > sess_number_of_replicas => 0 => 0 memcached.sess_randomize_replica_read => > Off => Off memcached.sess_remove_failed_servers => Off => Off memcached.sess_server_failure_limit > => 0 => 0 memcached.sess_connect_timeout => 0 => 0 memcached.sess_sasl_username > => no value => no value memcached.sess_sasl_password => no value => no value > memcached.sess_persistent => Off => Off memcached.sess_prefix => memc.sess. > key. => memc.sess.key. memcached.sess_lock_wait => not set => not set memcached. > sess_lock_max_wait => not set => not set memcached.compression_type => fastlz > => fastlz memcached.compression_factor => 1.3 => 1.3 memcached.compression_threshold > => 2000 => 2000 memcached.serializer => php => php memcached.store_retry_count > => 0 => 0 memcached.default_consistent_hash => Off => Off memcached.default_binary_protocol > => Off => Off memcached.default_connect_timeout => 0 => 0` * So I am just confused… - This topic was modified 3 years, 7 months ago by [dragonsway76](https://wordpress.org/support/users/dragonsway76/). Viewing 9 replies - 1 through 9 (of 9 total) * Plugin Contributor [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * (@vmarko) * [3 years, 7 months ago](https://wordpress.org/support/topic/memcached-working/#post-16150123) * Hello [@dragonsway76](https://wordpress.org/support/users/dragonsway76/) * Thank you for reaching out and I am happy to assist you with this Check the service at the CLI/SSH: memcached-tool 127.0.0.1:11211 display and memcached- tool 127.0.0.1:11211 stats. telnet 127.0.0.1 11211 should communicate with memcache and respond to status commands etc Look if the service is running: ps afux | grep memc restart the service if needed (as root/sudo): service memcached restart. * Thanks! * Thread Starter [dragonsway76](https://wordpress.org/support/users/dragonsway76/) * (@dragonsway76) * [3 years, 7 months ago](https://wordpress.org/support/topic/memcached-working/#post-16150894) * [@vmarko](https://wordpress.org/support/users/vmarko/) clearly u get this question a lot and didn’t read my post…:-/ But being patient, I followed your suggestions and they all verify that my memcache is installed and working correctly… * your plugin simply is not connecting to memcache.. * What next? * Plugin Contributor [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * (@vmarko) * [3 years, 7 months ago](https://wordpress.org/support/topic/memcached-working/#post-16152390) * Hello [@dragonsway76](https://wordpress.org/support/users/dragonsway76/) * Thank you for your feedback. I’ve read your question and all the information you shared. The message you’re getting from the W3TC means that the W3TC can detect the Memcached extension, however, the Memcached service needs to be restarted or your apache/nginx. I’ve tested this before answering you and I was able to install the Memcached and get it running and available in the W3TC. Please check [this tutorial](https://www.youtube.com/watch?v=kqZg0zGe0Jk), and let me know if it helps! * Thanks! * Thread Starter [dragonsway76](https://wordpress.org/support/users/dragonsway76/) * (@dragonsway76) * [3 years, 7 months ago](https://wordpress.org/support/topic/memcached-working/#post-16167287) * My apologies for my earlier cynicism… (pre-coffee posts are dangerous :-/ ) .. * In any case.. I did something pretty basic to figure out the problem… * I ran the built in compatibility check. * ``` Plugin Version: 2.2.7 PHP Version: 8.1.12; Web Server: Not detected FTP functions: Installed (required for Self-hosted (FTP) CDN support) Multibyte String support: Installed (required for Rackspace Cloud Files support) cURL extension: Installed (required for Amazon S3, Amazon CloudFront, Rackspace CloudFiles support) zlib extension: Installed (required for gzip compression support) brotli extension: Not detected (required for brotli compression support) Opcode cache: Installed (OPCache) Memcached extension: Installed Memcache extension: Installed Redis extension: Installed HTML Tidy extension: Installed (required for HTML Tidy minifier support) Mime type detection: Installed (Fileinfo) (required for CDN support) Hash function: Installed (hash) (required for NetDNA / MaxCDN CDN purge support) Open basedir: Off zlib output compression: Off set_time_limit: Available SSH2 extension: Installed (required for Self-hosted (FTP) CDN SFTP support) WordPress Resources /home/user/public_html/wp-content: OK /home/user/public_html/wp-content/uploads/2022/11: OK Fancy permalinks: /index.php/%postname%/ WP_CACHE define: Defined (true) URL rewrite: Disabled Network mode: Off ``` * I don’t think much of anything will run correctly, if the plugin doesn’t recognize my web server (which does have brotli installed). I am using Virtualmin that bundles that installs a lamp bundle… * How should I proceed.. I have restarted apache2 numerous times without success. * Thread Starter [dragonsway76](https://wordpress.org/support/users/dragonsway76/) * (@dragonsway76) * [3 years, 7 months ago](https://wordpress.org/support/topic/memcached-working/#post-16167307) * FYI, video not useful.. as stated previously memcached is correctly installed running.. again problem seems to be that the web server is not recognized * Plugin Contributor [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * (@vmarko) * [3 years, 7 months ago](https://wordpress.org/support/topic/memcached-working/#post-16173569) * Hello [@dragonsway76](https://wordpress.org/support/users/dragonsway76/) * No worries, I know this can be frustrating sometimes, and honestly, looking at the compatibility check, it’s very interesting that it’s not working, knowing that you followed all the steps. Just to confirm, are you able to telnet 127.0.0.1 11211 and also to restart the Memcached service? * ``` Opcode cache: Installed (OPCache) Memcached extension: Installed Memcache extension: Installed Redis extension: Installed ``` * The above shows that the PHP extensions are installed. I must mention that the W3TC only recognizes the [PHP extensions and this is why Brotli is not detected](https://github.com/kjdev/php-ext-brotli). As you also have Redis, have you tried using Redis as a caching method or are you experiencing the same problem there? * Thanks! * Thread Starter [dragonsway76](https://wordpress.org/support/users/dragonsway76/) * (@dragonsway76) * [3 years, 7 months ago](https://wordpress.org/support/topic/memcached-working/#post-16185746) * This was executed as my user running the wordpress installation.. clearly everything on my end is working. * ``` $ php -m [PHP Modules] apcu bcmath calendar Core ctype curl date dom exif FFI fileinfo filter ftp gd gettext gmp hash iconv igbinary imagick imap intl json libxml mbstring memcache memcached msgpack mysqli mysqlnd openssl pcntl pcre PDO pdo_mysql pdo_sqlite Phar posix pspell readline Reflection session shmop SimpleXML soap sockets sodium SPL sqlite3 ssh2 standard sysvmsg sysvsem sysvshm tidy tokenizer xdebug xml xmlreader xmlwriter xsl Zend OPcache zip zlib [Zend Modules] Xdebug Zend OPcache ``` * I haven’t tried Redis, because memcache is suppose to be faster… will give it a quick try in the morning * ``` $ php --ri memcached memcached memcached support => enabled Version => 3.2.0 libmemcached version => 1.0.18 SASL support => yes Session support => yes igbinary support => yes json support => yes msgpack support => yes Directive => Local Value => Master Value memcached.sess_locking => On => On memcached.sess_lock_wait_min => 150 => 150 memcached.sess_lock_wait_max => 150 => 150 memcached.sess_lock_retries => 5 => 5 memcached.sess_lock_expire => 0 => 0 memcached.sess_binary_protocol => On => On memcached.sess_consistent_hash => On => On memcached.sess_consistent_hash_type => ketama => ketama memcached.sess_number_of_replicas => 0 => 0 memcached.sess_randomize_replica_read => Off => Off memcached.sess_remove_failed_servers => Off => Off memcached.sess_server_failure_limit => 0 => 0 memcached.sess_connect_timeout => 0 => 0 memcached.sess_sasl_username => no value => no value memcached.sess_sasl_password => no value => no value memcached.sess_persistent => Off => Off memcached.sess_prefix => memc.sess.key. => memc.sess.key. memcached.sess_lock_wait => not set => not set memcached.sess_lock_max_wait => not set => not set memcached.compression_type => fastlz => fastlz memcached.compression_factor => 1.3 => 1.3 memcached.compression_threshold => 2000 => 2000 memcached.serializer => php => php memcached.store_retry_count => 0 => 0 memcached.default_consistent_hash => Off => Off memcached.default_binary_protocol => Off => Off memcached.default_connect_timeout => 0 => 0 ``` * ``` $ php --ri memcache memcache memcache support => enabled Version => 4.0.5.2 Revision => $Revision$ Directive => Local Value => Master Value memcache.allow_failover => 1 => 1 memcache.max_failover_attempts => 20 => 20 memcache.default_port => 11211 => 11211 memcache.chunk_size => 32768 => 32768 memcache.protocol => ascii => ascii memcache.hash_strategy => consistent => consistent memcache.hash_function => crc32 => crc32 memcache.redundancy => 1 => 1 memcache.session_redundancy => 2 => 2 memcache.compress_threshold => 20000 => 20000 memcache.lock_timeout => 15 => 15 memcache.session_prefix_host_key => Off => Off memcache.session_prefix_host_key_remove_www => On => On memcache.session_prefix_host_key_remove_subdomain => Off => Off memcache.session_prefix_static_key => no value => no value memcache.session_save_path => no value => no value memcache.prefix_host_key => Off => Off memcache.prefix_host_key_remove_www => On => On memcache.prefix_host_key_remove_subdomain => Off => Off memcache.prefix_static_key => no value => no value ``` * Thread Starter [dragonsway76](https://wordpress.org/support/users/dragonsway76/) * (@dragonsway76) * [3 years, 7 months ago](https://wordpress.org/support/topic/memcached-working/#post-16186222) * In any case, I solved the mystery of why the compatibility check said apache2 wasn’t installed. * It was a ModSec Security features that blanks out the name of the server. * Changing this: /etc/modsecurity/modsecurity.conf:SecServerSignature ” ” * To this: /etc/modsecurity/modsecurity.conf:SecServerSignature “Apache ” * Solved that mystery. * However, while trying to troubleshoot my original memcached problem…. I discovered this non-sense on my dashboard. * “The required directives for fancy permalinks could not be detected, please confirm they are available:” * I call it non-sense because I immediately opened your compatibility checker… * Which, of course, confirmed that there is no problem with my permalinks: * > [View post on imgur.com](https://imgur.com/m5FMdMr) * (not an impressive first time use of your plugin)… * FYI, I just switched from memcached to redis and everything seems to be working fine….. * Question: I setup a redis unix socket which is faster than TCP, how can I use that with your settings? * And, of course, how can I get rid of the permlink garbage on the dashboard? * Plugin Contributor [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * (@vmarko) * [3 years, 7 months ago](https://wordpress.org/support/topic/memcached-working/#post-16196713) * Hello [@dragonsway76](https://wordpress.org/support/users/dragonsway76/) * Thank you for your feedback. This may happen sometimes in some environments. What you can try is to go to Settings > Permalinks > and change Permalinks to plain and save. After that switch back the Permalink structure to the one you had before and save it again. This should resolve the problem. * W3 Total Cache supports Redis Unix socket. All you need to replace the default hostname with a Redis Unix socket (usually /var/run/redis/redis.sock or /var/ run/redis/redis.sock:0) * I hope this helps! * Thanks! Viewing 9 replies - 1 through 9 (of 9 total) The topic ‘Memcached Not Working’ is closed to new replies. * ![](https://ps.w.org/w3-total-cache/assets/icon-256x256.png?rev=1041806) * [W3 Total Cache](https://wordpress.org/plugins/w3-total-cache/) * [Frequently Asked Questions](https://wordpress.org/plugins/w3-total-cache/#faq) * [Support Threads](https://wordpress.org/support/plugin/w3-total-cache/) * [Active Topics](https://wordpress.org/support/plugin/w3-total-cache/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/w3-total-cache/unresolved/) * [Reviews](https://wordpress.org/support/plugin/w3-total-cache/reviews/) * 9 replies * 2 participants * Last reply from: [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * Last activity: [3 years, 7 months ago](https://wordpress.org/support/topic/memcached-working/#post-16196713) * Status: resolved