Troubleshooting: "Impossible to establish video session with the server" errors - Security Center 5.8

If you receive an Error: Impossible to establish video session with the server message, you can try to determine the cause.

1. Make sure your server is running.
2. Make sure the Archiver role is online:
   1. In the Config Tool Video task, select the Archiver.
   2. At the bottom of the Video task, click Maintenance > Diagnose ().
   3. Fix any issues that are found.
3. If you are trying to view a federated camera, confirm that the Security Center Federation™ role or the Omnicast™ Federation™ role is online:
   1. In the Config Tool System task, click the Roles view.
   2. Select the Federation™ role and click Maintenance > Diagnose ().
   3. Fix any issues that are found.
4. If you are trying to view a federated camera, confirm that the server for the federated Security Center system is online.
5. It might be a Media Router connection problem. Make sure the Media Router role is online:
   1. In the Config Tool System task, click the Roles view.
   2. Select the Media Router role and click Maintenance > Diagnose ().
   3. Fix any issues that are found.
6. Restart the Media Router role:
   1. In the Config Tool System task, click the Roles view.
   2. Select the Media Router role and click Maintenance > Deactivate role ().
   3. In the confirmation dialog box that opens, click Continue.
      The Media Router turns red.
   4. At the bottom of the System task, click Maintenance > Activate role ().
7. Make sure the unit is online.
   If the unit is red in the Roles and units view, then troubleshoot why the video unit is offline.