The Unique School Book (LSU) is the national application where each teacher enters periodic reports and end-of-cycle assessments for their students, from CP to third grade. In the Versailles academy, access is through the ARENA portal, and the period leading up to the end-of-year report cards concentrates almost all technical and organizational difficulties.
Attachment to the structure and configuration of periods: two invisible prerequisites of the LSU
A teacher who connects to ARENA without issue but does not see the link to the LSU often faces a blockage upstream, not a bug in the application itself. The display of the LSU module depends on the attachment of the teacher to an active structure in the academic directory.
Specifically, if the school principal or head of establishment has not synchronized the classes in the LSU at the beginning of the year, the link does not appear in the ARENA menu of the concerned teacher. This synchronization links the Base Elèves (first degree) or SIECLE (second degree) data to the LSU.
The second lock is the configuration of evaluation periods. As long as the principal has not defined the periods (quarters, semesters, or any other division chosen by the team), data entry remains inaccessible for teachers, even if their ARENA account works perfectly. Before any attempt at technical troubleshooting, checking these two points with the school administration helps avoid wasting time on false leads.
Those looking to use LSU on Arena AC Versailles benefit from ensuring these prerequisites at the start of the school year, rather than discovering them the day before the class council.
Third-party cookies and script blockers: browser obstacles that tutorials overlook
Institutional guides describe the procedure for connecting to ARENA but overlook a common issue: some browsers block the loading of the LSU interface without displaying an explicit error message. The screen remains blank or the page spins indefinitely.
The LSU uses requests to several subdomains to verify the teacher’s affiliation with their structure. These requests are sometimes interpreted as third-party cookies by the browser. Firefox, in particular, has a default enhanced tracking protection that can interrupt these exchanges.
- Temporarily disable enhanced tracking protection for the site id.ac-versailles.fr (shield icon in the address bar on Firefox).
- Allow pop-ups for the LSU domain, as some validation windows open in a new tab that the browser silently blocks.
- Disable ad blocker or script blocker extensions (uBlock Origin, NoScript) during data entry.
- Prefer private browsing mode if the problem persists, which neutralizes extensions and corrupted caches in one action.
These settings take less than a minute and resolve the majority of frozen screens that teachers report at the end of the year.
Conditions for locking LSU periodic reports
Filling out a report is not enough: it must be lockable to appear in the booklet accessible to families. The conditions for locking are specific and should be known before starting data entry, not when the application refuses to validate.
A periodic report is lockable if the general assessment of the student’s progress is filled out, if at least three domains of the core competencies are completed, and if each filled domain is complete (assessment or at least one program element positioned).
Specific case of CM2 and digital competencies
For CM2 students, the last periodic report requires that at least one digital competency be assessed. If none are, an explanatory comment must be entered. Forgetting this point blocks the locking of the entire report and generates an error that many teachers do not immediately understand.
Preparing a summary grid for each student before opening the LSU allows for identifying incomplete reports before data entry rather than discovering them one by one in the application.
LSU support circuit in the Versailles academy: who to contact based on the type of issue
The common reflex is to write a generic email to the academic IT support. The problem is that there are three distinct circuits, and addressing your request to the wrong contact prolongs the resolution time by several days, sometimes beyond the data entry deadline.
- Problem with ARENA username or password: contact academic support via the Colibris platform, which manages email and authentication accounts.
- ARENA works but the LSU link does not appear: the intermediary is the school principal or head of establishment, who must check the synchronization of classes and the teacher’s attachment to the structure.
- ARENA and the LSU link work, but an application bug prevents data entry or locking: report the issue to the national LSU support, as the academy does not have control over the application code.
Identifying the correct circuit from the first report saves considerable time during a period when response times are mechanically lengthening.
The last useful precaution is not to wait until the last week before the class council to open the LSU. The national servers experience significant load during peak end-of-year data entry times, which amplifies the slowness related to verification requests for affiliation to structures. Spreading data entry over two to three weeks reduces both the technical risk and the pressure on assessments written in haste.