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Verify TeleService software is installed on the HMI: Navigate to Windows Control Panel > Programs and Features, confirm 'SINUMERIK TeleService' is listed with correct version for your 840D system.

Check TeleService license validity: Open TeleService application, verify license status is active and not expired. Contact Siemens for license renewal if necessary.

Reinstall TeleService software: Uninstall existing TeleService application, reboot HMI, then reinstall from official Siemens installation media matching your system version.

Document current configuration settings before uninstalling. Ensure machine is not in production during this process.

Verify TeleService configuration file integrity: Check C:\SINUMERIK\TeleService directory for corrupted or missing .ini or .cfg files. Restore from backup or default templates if necessary.

Verify network adapter is active and properly configured: Check Windows Network Connections, ensure Ethernet adapter shows 'Connected' status with valid IP address assigned (static or DHCP based on site configuration).

Check Windows Firewall settings: Open Windows Firewall > Allow an app through firewall, verify 'SINUMERIK TeleService' has both Private and Public network checkboxes enabled for incoming and outgoing connections.

Verify required TeleService ports are not blocked: Test ports 5900 (VNC), 443 (HTTPS), and any custom ports configured. Use 'telnet <server_IP> <port>' or netstat commands from HMI command prompt to verify connectivity.

Contact IT department to verify corporate firewall/router rules: Ensure no network-level blocking exists for TeleService traffic. Provide Siemens TeleService documentation showing required ports and protocols to IT for whitelisting.

Coordinate with facility IT department before making network infrastructure changes.

Verify TeleService is running with administrator privileges: Right-click TeleService shortcut, select Properties > Compatibility tab, ensure 'Run this program as administrator' is checked.

Check Windows Event Viewer for system errors: Open Event Viewer > Windows Logs > Application and System, look for error entries timestamped when alarm occurred, particularly related to TeleService or network services.

Temporarily disable antivirus software: Add TeleService directory and executable to antivirus exclusion list, or temporarily disable antivirus to test if it's blocking TeleService initialization.

Only disable antivirus temporarily for testing. Ensure machine is not exposed to untrusted networks during this test.

Restart HMI system services: Open Services.msc, restart 'TCP/IP NetBIOS Helper', 'Remote Access Connection Manager', and any Siemens-specific services. Reboot HMI if services fail to restart cleanly.

Coordinate HMI reboot with production schedule to minimize downtime.