Folks, I tested on my 3 machines, you need to copy over the testnet3 folder to new machines you setup.
I upload my testnet3 folder here. Download it and overwrite your current folder then zcashd should be able to connect to peer leastauthority ip.
https://github.com/waterholeio/zcash.z8.testnet3
If you have not been able to connect to mine I assume you have 0 in wallet. But anyway if you do have some inside, then
back up you wallet.dat before overwrite the folder and mv it inside testnet3 later.