Known Issues | ConnectX-9 Firmware RN

ConnectX-9 has the same feature set and limitations as the ConnectX-8 SuperNIC. For the list of ConnectX-8 known issues, refer to: https://docs.nvidia.com/networking/software/adapter-firmware/index.html#connectx-8.

The limitations listed below apply to ConnectX-9 only.

Internal Ref.	Issue
5072222	Description: In DirectNIC and SocketDirect topologies, PCIe TLP Analyzer visibility is limited to the host’s management domain. Traffic passing through an unmanaged host link, such as a DirectNIC connection to a GPU, is not visible to the local tracer.
	Workaround: N/A
	Keywords: PCIe TLP Analyzer
	Detected in version: 82.49.1014
4893639	Description: Direct Memory Access (DMA) protection is not supported in the ipxe.efi driver.
	Workaround: N/A
	Keywords: DMA
	Detected in version: 82.49.1014
4835832	Description: In rare cases, certain module types may experience link-up failures.
	Workaround: Configure the requested speed using the following commands: `mlxconfig -d <device> set PHY_RATE_MASK_OVERRIDE_P<port>=1` `mlxfwreset -d <device> r -y --no_mst` `mlxconfig -d <device> set PHY_RATE_MASK_P<port>=<PTYS.speed_mask> (speed mask is defined in PRM)` `mlxfwreset -d <device> r -y --no_mst`
	Keywords: Cables
	Detected in version: 82.48.1000
4809493 / 4804815 / 4884845	Description: Running lane margin tests may disrupt traffic, cause connection drops, or degrade performance.
	Workaround: Disable the drivers before starting the Lane Margin test. Set an error threshold of 2. If the connection drops or performance degrades, re-run the process.
	Keywords: Lane Margin
	Detected in version: 82.48.1000
4806964 / 4829338 / 4843305 / 4857738	Description: When bringing up 800G_8x on ConnectX-9 with Spectrum-4 switch systems, switch firmware version xx.201.3916-020 or later is required; earlier versions may fail to link up at 800G_8x.
	Workaround: N/A
	Keywords: Linkup, cables, Spectrum-4, 800G_8x
	Detected in version: 82.48.1000

Last updated: June 07, 2026