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I am trying to get test ether on ropsten testnet, so I set coinbase address like

miner.setEtherbase("0xxxxxxxxxxxxxx")

and started to mine from my node,

miner.start(4);

But someone changed the coinbase address of my node, after few days later, the address is

https://ropsten.etherscan.io/address/0xd9ee4d08a86b430544254ff95e32aa6fcc1d3163

But I have to open my RPC end point to use for other team members. So is there any other way to prevent to change my node coinbase address??

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In geth you can restrict IPs that can connect to your node with the command line parameter --netrestrict.

--netrestrict value   Restricts network communication to the given IP networks (CIDR masks)

If you want more complex filtering capabilities you can use a firewall in front of your node.

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