What is the script to download protocol.json to preprod testnet as required in this documentation: Minting Native Assets | Cardano Developer Portal
The script: cardano-cli query protocol-parameters $testnet --out-file protocol.json
Is not working.
1 - If you get an error like: cardano-cli: HandshakeError (Refused NodeToClientV_15 "version data mismatch: NodeToClientVersionData {networkMagic = NetworkMagic {unNetworkMagic = 764824073}, query = False} /= NodeToClientVersionData {networkMagic = NetworkMagic {unNetworkMagic = 1097911063}, query = False}")
that means you’re querying the testnet through a mainnet node. If that’s your problem then just use --mainnet instead of $testnet (or set testnet=--mainnet for the rest of your token minting scripts on that page).
2 - If you get an error telling you how to use the command: Usage: cardano-cli query protocol-parameters [--socket-path SOCKET_PATH] …
that means $testnet is blank and you missed the definition further up the page:
testnet="--testnet-magic 1097911063"
… in a group of commands that set some token related variables. It’s easily missed there and perhaps should be moved up near the top where other necessary varaibles like CARDANO_NODE_SOCKET_PATH are defined. If that’s the case let me know & I’ll edit the page accordingly.
Generally when you are posting problem on the Forum or anywhere, it’s good manners & gets better results when you quote the error you are having. 
(p.s.) 3 - if it says Missing: --socket-path SOCKET_PATH
that means you don’t have CARDANO_NODE_SOCKET_PATH defined, or are not on a Cardano node and need to start the process at an earlier stage 
You are including a bash variable assignment statement when you are support to be including a variable reference. If you run the 2 commands:
$ testnet="--testnet-magic 1097911063"
$ cardano-cli query protocol-parameters $testnet --out-file protocol.json
(so that the testnet variable in the first command is put into place with the $ in the second command) it will work… or at least you will get a more appropriate error message.
If you need to post that error message, please copy & paste the text instead of another screenshot.
Ok, so I ran the two commands and now have the following error:
cardano-cli: HandshakeError (Refused NodeToClientV_15 “version data mismatch: NodeToClientVersionData {networkMagic = NetworkMagic {unNetworkMagic = 1}, query = False} /= NodeToClientVersionData {networkMagic = NetworkMagic {unNetworkMagic = 1097911063}, query = False}”
That is the 1st error that you said I might come across and that the problem is that I’m running a mainnet node but I downloaded the prepod configuration files so I thought I was in testnet? My node epoch is only at 84.
Since that’s practically the same error I get on Mainnet, hopefully someone with a running testnet node can respond & help you break it down further. I’ll keep watching this thread in case there are any changes we need to make to this documentation page. 
Thanks again! I’m starting a new relay node with mainnet configuration files. 
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Please note that pre-prod magic number is 1, i.e. on pre-prod the command must be
testnet="--testnet-magic 1"
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That did the trick. Problem solved!
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