> Source: [sk184477](https://support.checkpoint.com/results/sk/sk184477)

# sk184477 - MHO 140 unexpectedly shuts down when connected to console servers that provide signaling other than RX, TX, and GND

| Property | Value |
|----------|-------|
| Solution ID | sk184477 |
| Date Created | 2025-12-23 |
| Last Modified | 2025-12-29 |
| Technical Level | Advanced |
| Products | Scalable Platforms |
| Versions | R81.20 |
| OS | Gaia |
| Platform | Maestro Orchestrator |

## Symptoms

- * Several Maestro Hyperscale Orchestrator 140 (MHO-140) devices fail at the same time, causing a major service outage.

* The affected MHO-140 devices experience unexpected thermal shutdowns.

* The system does not provide correct hardware sensor readings.

* The issue begins shortly after connecting Moxa NPort 6610 terminal servers to the MHO-140 console ports using custom Registered Jack 45 (RJ-45) console cables and pinout adapters.

## Cause

The issue occurs because custom console cables and pinout adapters connected additional RS-232 control signals (such as Request to Send, Clear to Send, Data Terminal Ready, Data Set Ready) between the Moxa NPort 6610 terminal servers and the MHO-140 console ports.

MHO-140 devices, which are based on Nvidia/Mellanox SN2410 hardware, support only Receive (RX), Transmit (TX), and Ground (GND) signals on its RS-232 console port. Connecting any additional RS-232 control lines can cause hardware malfunctions, including sensor readout failures and thermal shutdowns.

Both Check Point and the hardware manufacturer (Nvidia/Mellanox) confirmed that only RX, TX, and GND must be connected, and that all other RS-232 signals must remain unconnected.

In addition, differences in electrical grounding and the use of passive pinout adapters may introduce electrical noise or improper signaling, further contributing to device instability.

## Solution

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