Code 130-07E2: Non-secure DNC connection %1 detected from %2
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Non-secure DNC connection %1 detected from %2 alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
[Cause of error] An application has established a non-secure DNC connection to the control, or tried to do so. Note: In order to significantly increase IT security, DNC connections are by default permitted only through an SSH tunnel now. This non-secure connection could only be established because it was explicitly permitted in the machine parameter allowUnsecureRPC. In the future it will not be possible to permit non-secure connections in the machine configuration. [Error correction] - Migrate the affected application to a secure DNC connection. HEIDENHAIN offers a configuration for secure communication. - Use the newest versions of HEIDENHAIN programs (such as TNCremo) and configure a secure connection. - If the application does not come from HEIDENHAIN: Notify the manufacturer of the affected application. [34] 10/2023
Source: HEIDENHAIN NC Error Messages — TNC7/640/620/320/128, CNC PILOT 640, MANUALplus 620 (10/2023)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Heidenhain TNC Series CNC Alarms
Heidenhain controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 130-07E2 on the TNC Series CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Heidenhain's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4497 Heidenhain TNC Series CNC codes.
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