Is the ethernet port ( network port ) working on the second PC ? Have a look in Device Manager to see if it is listed , even though it is there physically it may not be enabled in the bios .
Huawei P10 review
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.