If I've created a multichain node using params anyone can connect can i change it now ? i want only few more nodes to be able to connect to my running multichain-node. I want to block malicious notes to be able to connect.
MultiChain 2.0 beta 2, scheduled for release next week, will allow this. You'll need to first upgrade your blockchain to the latest protocol, and then you can upgrade the anyone-can-connect parameter.