I have this weird issue. I have 5 Ubuntu servers mounting a vSAN NFS share. 4/5 mount without issue. Server-02 times out. Will mount to other NFS Shares, but times out and doesn't mount the vSAN NFS Share. I have rebuilt the server several times, using the same Server-02 hostname, and it will not mount.
If I change the name to say Server-10 it mounts fine. Change it back to Server-02 and same issue. Not sure if there is something on the vSAN side creating this.