- Plesk for Linux
One of the following symptoms is true for webmail:
Unable to log into Roundcube webmail with correct credentials:
CONFIG_TEXT: Connection to storage server failed
Webmail is not accessible with the error message:
PLESK_INFO: Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log.
Children of different processes are killed with signal 9. The corresponding message appears in
CONFIG_TEXT: server spamd: spamd: handled cleanup of child pid  due to SIGCHLD: KILLED, signal 9 (0009)
server dovecot: service=pop3, firstname.lastname@example.org ip=[203.0.113.2]. Fatal: master: service(pop3): child 32379 killed with signal 9
Plesk or Plesk extensions do not work.
The following error messages appear in
CONFIG_TEXT: kernel: PAX: terminating task: /opt/plesk/php/7.3/bin/php-cgi(php-cgi):20401, uid/euid: 994/994, PC: 000003337a7ed010, SP: 0000039fadcfccd8
kernel: grsec: denied resource overstep by requesting 4096 for RLIMIT_CORE against limit 0 for /opt/plesk/php/7.3/bin/php-cgi[php-cgi:20401] uid/euid:994/994 gid/egid:1006/1006, parent /usr/sbin/httpd[/usr/sbin/httpd:27947] uid/euid:0/48 gid/egid:48/48
CONFIG_TEXT: Application: plesk-migrator
Error: denied RWX mmap of <;anonymous mapping>; by /usr/local/psa/admin/sbin/modules/panel-migrator/plesk-migrator[plesk-migrator:25177] uid/euid:0/0 gid/egid:0/1001, parent /usr/bin/sw-engine[sw-engine:25164] uid/euid:0/0 gid/egid:0/0
Grsecurity system is blocking Plesk executable files.
Grsecurity is not supported by Plesk.
As a workaround, add the binary from the error message to exclusions of PAX monitoring. In this example, PHP 7.3 is added to the exclusions:
# paxctl -cm /opt/plesk/php/7.3/bin/php-cgi