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The Webmin SSL LE renewal setting is labeled as "Months between automatic renewal", but it was previously saved as a calendar-style cron month expression like `*/N`. That is not the same as an elapsed renewal interval. Webmin’s cron matcher evaluates month schedules against calendar month numbers, so values like `*/5`, `*/12`, or values above `12` do not reliably mean “renew every N months”. This could cause uneven or dangerously late renewal timing. This changes the renewal job to use Webmin cron’s elapsed `interval` support instead of calendar-month matching. - Saves automatic renewal as `renew * 30 * 24 * 60 * 60` seconds. - Clears the cron time fields so the scheduler uses the interval path only. - Keeps `months => '*/N'` so the SSL UI can continue to display the saved renewal value. - Resets the renewal timer only after a newly issued certificate. - Preserves the existing renewal timer for settings-only saves. - Migrates existing month-based Let's Encrypt renewal jobs during postinstall.
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Webmin is a web-based system administration tool for Unix-like servers, and services with about 1,000,000 yearly installations worldwide. Using it, it is possible to configure operating system internals, such as users, disk quotas, services or configuration files, as well as modify, and control open-source apps, such as BIND DNS Server, Apache HTTP Server, PHP, MySQL, and many more.
Usability can be expanded by installing modules, which can be custom made. Aside from this, there are two other major projects that extend its functionality:
- Virtualmin is a powerful, flexible, most popular, and most comprehensive web-hosting control panel for Linux, and BSD systems, with over 150,000 installations worldwide. It is available in an open-source community-supported version, and a more feature-filled version with premium support;
- Usermin presents and controls a subset of user-centred features, rather than administrator-level tasks.
Webmin includes 116 standard modules, and there are at least as many third-party modules.
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Perl 5.10 or higher.
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For detailed installation instructions check our guide on webmin.com/download page.
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Webmin is released under the BSD License.