# Troubleshooting During Installation

Restart the ToolsTalk Industrial Technique Host service after upgrading ToolsTalk 2.

Error | Solution
--- | ---
Error code 1920 Failed to start. Verify you have correct permission | Database authentication error. For the SQL database mixed mode authentication must be configured. Use the SQL management studio to correct the authentication. A restart of the computer is most likely needed before another installation attempt can be made.

The InstallShield Wizard detects if installations have already been made, when using an installation file. If older installations are present on the computer, they may not be detected.

It is therefore recommended to remove old instances of the program and of the database catalog before starting a new installation.