It looks like ProxMox is based off a Debian distro, which isn't a supported OS. The OS may need a driver for the 10Gb NIC. You might verify that one is installed with lsmod. What happens if you manually try to put the interface into an up state? I ask because it could be the case that a config file has them defaulting to down.
You can also verify that the hardware works by using a live Linux image. We have one that is built off of CentOS. If you boot to that and the NICs still don't connect, you can at least begin to limit the scope of your troubleshooting.
Edit: I also looked at parts support, and according to this matrix, the 57710 was validated in the 9th, 10th, and 11th generation servers, but the server in question is a 12th generation. There may be a compatibility issue, too.
iliaK
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Posted February 3rd, 2019 05:00
i found the solution, the switch ports were down,, it is my first time configuring switch,, i didnt know the default off all interface are down,