Vagrant Hangs Mounting NFS Shared Folders
NFS fails to mount when running vagrant up and hangs indefinitely at ==> default: Mounting shared folders....
Your firewall may be blocking one or more of the various ports required by NFS. I haven't definitively sorted out how to open all the needed ports, but disabling the firewall on your development machine will allow you test if this your problem or not.
Articles on Managing Linux Firewalls to Work with NFS
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