Rsnapshot doesn't make monthly backups, why?

Question

linux

Hello everyone, for some reason rsnapshot doesn't want to make monthly backups... Weekly and daily backups are no problem.
/etc/rsnapshot.conf

#interval hourly 6
interval daily 2
interval weekly 2
interval monthly 2

/etc/crontab

30 5 * * * root /usr/bin/rsnapshot daily
0 5 * * 1 root /usr/bin/rsnapshot weekly
1 6 27 * * root /usr/bin/rsnapshot monthly

Answer 1

manually launched? what's in the rsnapshot/cron logs?

Answer 2

https://github.com/ratchetphp/Pawl

Answer 3

php.net/manual/en/function.fsockopen.php