How to prevent to change coinbase address for geth?

Question

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

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??

may this answer is what you looking for : https://ethereum.stackexchange.com/questions/3163/how-can-i-expose-geths-rpc-server-to-external-connections — Mahesh Rajput, Feb 22 '19 at 09:14
sounds like you have exposed your RPC to external connections?
How is your node configured? — Matt Swezey, Feb 22 '19 at 14:58

score 0 · Answer 1 · answered Feb 22 '19 at 19:32

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.

1 Answers1