The most common culprit is an incorrect connection string within the configuration files. TecDoc relies heavily on a local or network database (often MySQL or Transbase).

Ensure the ServerName , Port , and DatabaseName match your actual setup. If you are running a local installation, the server should typically be localhost or 127.0.0.1 .

Add the TecDoc installation folder to your Antivirus "Exclusion" list.

Sometimes the configuration is perfect, but the "engine" isn't running. Press Win + R , type services.msc , and hit Enter. Look for services related to , Transbase , or MySQL .

If the error persists after checking the config files, a registry key might be missing or corrupted.

Ensure that your Windows Firewall isn't blocking the ports used by the database (commonly port 3306 for MySQL or 2024 for Transbase). 6. Corrupt Installation or Missing Registry Keys

Set the Startup Type to to prevent this from happening after a reboot. 4. Run as Administrator

Advanced users can check HKEY_LOCAL_MACHINE\SOFTWARE\TecDoc to ensure the installation paths registered in Windows match the actual folder locations.