# System Maintenance

*Tools → Maintenance* contains server-wide maintenance actions. Each action asks for confirmation and **can't be undone**.

[![maintenance](https://help.snono-systems.com/uploads/images/gallery/2026-11/scaled-1680-/maintenance.png)](https://help.snono-systems.com/uploads/images/gallery/2026-11/maintenance.png)

<table id="bkmrk-sectionwhat-it-does-" style="width: 100%; height: 546.4px;"><thead><tr style="height: 29.6px;"><th style="width: 22.4906%; height: 29.6px;">Section</th><th style="width: 77.4847%; height: 29.6px;">What it does</th></tr></thead><tbody><tr style="height: 46.4px;"><td style="width: 22.4906%; height: 46.4px;">Power Control</td><td style="width: 77.4847%; height: 46.4px;">**Reboot** or **Shutdown** the server. After a shutdown, the server must be started again on site or from the hosting console.</td></tr><tr style="height: 46.4px;"><td style="width: 22.4906%; height: 46.4px;">Logout All Managers</td><td style="width: 77.4847%; height: 46.4px;">Ends all panel sessions, including yours. Everyone must log in again.</td></tr><tr style="height: 46.4px;"><td style="width: 22.4906%; height: 46.4px;">Force Change Password</td><td style="width: 77.4847%; height: 46.4px;">All managers (except the *admin* account) must choose a new password the next time they open the panel.</td></tr><tr style="height: 48.8px;"><td style="width: 22.4906%; height: 48.8px;">Import SAS3 Database</td><td style="width: 77.4847%; height: 48.8px;">Opens the migration wizard. See [Migrating from SAS3](https://help.snono-systems.com/books/sas-radius/page/migrating-from-sas3).</td></tr><tr style="height: 63.2px;"><td style="width: 22.4906%; height: 63.2px;">Clear Sessions Table</td><td style="width: 77.4847%; height: 63.2px;">Deletes **all** session history. Traffic counters and quotas are not affected. Online users reappear after the routers' next interim updates. Use it only when the system is very slow because of a huge session table.</td></tr><tr style="height: 63.2px;"><td style="width: 22.4906%; height: 63.2px;">Close Online Sessions</td><td style="width: 77.4847%; height: 63.2px;">Marks all open sessions as closed in SAS Radius, without disconnecting anyone on the routers. Users really online reappear at the next interim update. Use it to clear stuck sessions (for example false "exceeded max sessions").</td></tr><tr style="height: 46.4px;"><td style="width: 22.4906%; height: 46.4px;">Delete Expired Users</td><td style="width: 77.4847%; height: 46.4px;">Deletes expired users (on profiles with Limit Expiration) to stay below your license limit. Users with a balance are skipped. With many expired users, repeat until none are left.</td></tr><tr style="height: 63.2px;"><td style="width: 22.4906%; height: 63.2px;">Delete Expired Card Users</td><td style="width: 77.4847%; height: 63.2px;">Deletes expired users created from prepaid login cards.</td></tr><tr style="height: 46.4px;"><td style="width: 22.4906%; height: 46.4px;">Clear Email Queue</td><td style="width: 77.4847%; height: 46.4px;">Deletes emails waiting to be sent.</td></tr><tr style="height: 46.4px;"><td style="width: 22.4906%; height: 46.4px;">Clear SMS Queue</td><td style="width: 77.4847%; height: 46.4px;">Deletes SMS messages waiting to be sent.</td></tr></tbody></table>

<p class="callout warning">Create and download a backup before deleting users or clearing sessions.</p>

*Required permission: Managers - System Administrator*