Mining pools supportxmr.com and minexmr.com are blocked by providers like vultr.com
miner@vultr_vps:~# ping pool.minexmr.com
ping: unknown host pool.minexmr.com
Hard coding IP addresses isn't possible, because multiple mining servers are setup with a round robin DNS behind the domain.
Any idea how I can access the pool anyway?
I solved this same issue today on Vultr. It's just a matter of not using their DNS servers (the example below uses the free DNS service offered by Google).
On Ubuntu 18.04 all you gotta do is open your DNS config for editing:
sudo nano /etc/resolv.conf
Then delete the entire contents of the file, and replace with:
nameserver 8.8.8.8
nameserver 8.8.4.4
Cheers :)