Hi Since our update to 19.11.09 we start having problems with kona. We initially thought it was apache since without any notice, koha stop responding. When doing ps-ef |grep apache we got hundreds of entries even though we have very low load. Max 3 users at a time. Restarting apache solved the issue for a while On the server we only have koha and mod_pagespeed. Boith using the same instance of memcached. We disabled mod_pagespped and for a while, it looked like it was the problem, but after a couple of days, the issue returned. using netstat we found that there were lots of CLOSE_WAIT connections to port 11211. So we decided to configure two instances of memcached in two different ports. One for koha and one for mod_pagespeed. The issue of CLOSE_WAIT connections is less often now. However they are almost always related to perl . # sudo netstat -tulpan |grep 11211 gives us tcp 1 0 127.0.0.1:54368 127.0.0.1:11211 CLOSE_WAIT 1411/perl And checking the perl process: #ps -ef |grep 1411 bibliot+ 1411 1407 0 Sep18 ? 00:01:44 /usr/bin/perl /usr/share/koha/bin/migration_tools/rebuild_zebra.pl -daemon -sleep 5 Also, we noticed that, at anytime, memcached port has at least 10-15 connections split between memcached process and starman workers Is that normal? mod_pagespeed didn´t have any problem since it is configured to use an independant memcached instance Koha 19.11.09 Ubuntu bionic memcached 1.5.6 Regards Alvaro |----------------------------------------------------------------------------------------| Stay safe / Cuídate/ Reste sécurisé *7* Switch off as you go / Apaga lo que no usas / Débranchez au fur et à mesure. *q *Recycle always / Recicla siempre / Recyclez toujours P Print only if absolutely necessary / Imprime solo si es necesario / Imprimez seulement si nécessaire