Plesk is down and it works after restart of psa service. The following errors in
[22-Jun-2017 12:09:54] WARNING: [pool plesk] server reached max_children setting (26), consider raising it
max_children settings has reached its limits.
Increase value for
max_children parameter in
# grep max_children /etc/sw-engine/pool.d/plesk.conf
pm.max_children = 50