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Siemens SINUMERIK Controller
Communication · Intermediate · 30-120 minutes
Siemens 840D 100936 - Remote diagnostics:Remote diag. port at default setting(5800)!
This alarm indicates that the remote diagnostics port is still configured at the factory default setting of 5800. This is a security warning rather than a critical fault, alerting the operator that the default port configuration poses a potential security vulnerability for unauthorized remote access to the control system.
100936
Siemens 840D 100936 - Remote diagnostics:Remote diag. port at default setting(5800)!
Remote diagnostics:Remote diag. port at default setting(5800)!
Siemens SINUMERIK alarm 100936: Remote diagnostics:Remote diag. port at default setting(5800)!. This alarm indicates an error condition in the NC program or control configuration that must be resolved before the operation can continue.
Root Cause Summary
This alarm indicates that the remote diagnostics port is still configured at the factory default setting of 5800. This is a security warning rather than a critical fault, alerting the operator that the default port configuration poses a potential security vulnerability for unauthorized remote access to the control system.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access the HMI and navigate to Startup → Commissioning → Network Settings → Remote Diagnostics.
- 2
Locate the remote diagnostics port setting (currently showing 5800).
- 3
Change the port number to a non-standard port value between 49152-65535 (dynamic/private port range) and document this change.
Coordinate with IT department to ensure the new port does not conflict with other network services and update firewall rules accordingly.
- 4
Save the settings and perform a control system reboot to apply the changes. Verify the alarm clears after restart.
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