# Session Management

Introduction

To set up a session, you must execute a LOGIN command. You must do this before you transmit any other RRI commands. This establishes your identity and determines the authorization information for the whole duration of the session.

To log out, clients should use the LOGOUT command. When it receives a LOGOUT command, the server terminates the session. It is not possible to send any further RRI commands to the server after that.

The following rules apply for the session management:

- You may hold 7 parallel sessions for each RegAcc.
- If the maximum number of sessions is reached, it is impossible to set up any further sessions. They will be rejected with an error message.

DENIC reserves the right to amend processing accordingly at any time.

Error Messages Related to Session Management

Below we have listed the error messages you may be confronted with during session management.

Error Code | Error Message | Brief Description
--- | --- | ---
83000000000 | Request message too long | The PDU is too large. The size of the PDU must not exceed 64KB.