- Plesk for Linux
Unable to log into Roundcube webmail with correct credentials:
CONFIG_TEXT: Connection to storage server failed
SELinux is Disabled:
Switching from Courier to Dovecot and back (or vice versa) does not resolve the issue.
Running of the
mchkutility does not resolve the issue:
# /usr/local/psa/admin/sbin/mchk --with-spam
rsyslog service stops working in several minutes after its start and logs are not written.
Children of different processes are killed with signal 9:
# less /var/log/maillog
server spamd: spamd: handled cleanup of child pid  due to SIGCHLD: KILLED, signal 9 (0009)
server dovecot: service=pop3, email@example.com ip=[203.0.113.2]. Fatal: master: service(pop3): child 32379 killed with signal 9
dmesgcommand shows that grsec blocks resource allocation:
[27520.982439] grsec: denied resource overstep by requesting 4096 for RLIMIT_CORE against limit 0 for /usr/libexec/paxtest/execstack[execstack:27825] uid/euid:0/0 gid/egid:0/0, parent /usr/libexec/paxtest/execstack[execstack:27824] uid/euid:0/0 gid/egid:0/0
[27521.125181] grsec: denied RWX mprotect of <anonymous mapping> by /usr/libexec/paxtest/mprotanon[mprotanon:27915] uid/euid:0/0 gid/egid:0/0, parent /usr/libexec/paxtest/mprotanon[mprotanon:27837] uid/euid:0/0 gid/egid:0/0
Grsecurity system is blocking the correct work of webmail.
Grsecurity is not supported by Plesk.
Contact grsec Support Department.