I would try a full uninstall of Avast restart the PC and attempt to connect to the server. AntiVirus and most software firewalls install a protocol on each NIC so it can intercept and check data coming in and out. That protocol may be corrupt and having issues when the packets start flying both ways. Its not the first time I've seen an AV or Firewall cause a full disconnect on one NIC and not the other.
Test it with Avast fully uninstalled, see if it works. Also, I'd be looking into update drivers for your NIC, or maybe a clean install of the NIC driver if removing Avast doesn't fix it.
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Latest hotfix: 0.8.5.3 (2025-05-09)