Check the LAN card properties set the speed into 10 full duplex instead of auto
How do you connect the two computers? Are they connected via Ethernet cable or wireless connection or wired and wireless?
If you're trying to connect the two computers wirelessly at the same time, there should be no problem. But you need to refer to the user manual of the router to see how many wireless clients it could support.
After verifying the number of wireless clients, access the logs of your wireless router and see how many MAC addresses are currently connected. Because there's a possibility that there are unknown wireless computers that are connected to the computer.
You may contact the manufacturer of the router to set a MAC filter and allow your two computers to connect. MAC filter is a highly secure filter that most routers have.
If you find out that only two computers were connected, then you might want to upgrade the firmware of your router to resolve your problem.
Good luck and have a great day!
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