Check your network settings. Dns and gateway. I doubt if anything on the server can communicate with the outside world
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Thanks for your answer! I think I found something weird inside unRAID . I'm using static IP address and I have also to add manual DNS. I used my router's IP (192.168.1.1) but the moment I mount the shares it changes to a different DNS server (169.254.238.60, maybe provided by my ISP, but it's different from the one my Mac is using, being in the same network). Also, if I manually set 8.8.8.8 and 8.8.4.4 as the DNS servers, it keeps using just 169.254.238.60. I don't know what's going on here . It has been working without problems since 2 years ago . Some dockers are failing too now .
169.254.x.x is what you get when you haven't been given an IP address.