How can I check who is logged into SL1

System > Monitor > Audit Logs will show you when someone has logged in. Filter the Message column by the string 'log'.

However, there is no record for an account timing out, and AFAIK no way to see 'active' sessions. I'm not even sure there is a concept of an active session.

With v12 there is the new setting System > Settings > Behaviour > User Login Session Timeout. This suggests there is a table somewhere that can see when an account last did something, but it isn't in master_access.accounts. Might be worth raising a support query.

Thank you everyone

You can check this using GraphQL as well. This query will show the account details and the last login times:

query accountSearch {
  accounts(first:1000, order: {direction: asc, field: "id"}) {
    edges {
      node {
        id
        lastLoginTime
        contact {
          cell
          department
          firstName
          lastName
          title
        }
        organization {
          id
        }
      }
    }
  }
}

And the link to docs: ScienceLogic - GraphQL API Introduction.

select * from master_access.access_log limit 5000

In the DB Tool:

SELECT * FROM master_access.access_log WHERE state = 1

ORDER BY login_time DESC

LIMIT 1000;

Other possible states are:

| id | description  |
+----+--------------+
|  0 | Logged Out   |
|  1 | Logged In    |
|  2 | Active       |
|  3 | Expired      |
|  4 | Terminated   |
|  5 | Failed Login |