MultiChain Developer Q&A - Recent questions tagged firewall

Can't connect two nodes on different networks

Fri, 14 Sep 2018 14:46:38 +0000

I'm creating a chain using multichain-util, setting a username and password in multichain.conf, and then starting the daemon using multichaind chainname -rpcallowip=0.0.0.0/0 -daemon.

I receive the following output:

Starting up node...

Other nodes can connect to this node using:

multichaind chainname@172.20.10.0:7217

Node ready.

When trying to use multichaind chainname@172.20.10.0:7217 -rpcport=7216 -rpcuser=multichainrpc -multichainpass=pass from another computer I receive:

Error: Couldn't connect to the seed node 172.20.10.0 on port 7217 - please check multichaind is running at that address and that your firewall settings allow incoming connections.

I have tried turning firewalls off to no success. I can create two nodes and connect them successfully when they are using the same internet connection, but can't find what the problem is here.

Node2 is getting stuck when trying to connect to Node1

Mon, 05 Mar 2018 11:20:03 +0000

I am using EC2 instances.

I installed multichiain in Node1 and everything works fine.

Then later I did the same in setup in Node2, once after modifying the inbound rules and giving rights to node2 in multichain.

I am able to connect, but connection is not complete, it got stuck as below for a long time.

Unable to retreive params in node2 as well.

ubuntu@ip-172-31-22-80:~$ multichaind chain1@172.31.41.67:9543
MultiChain Core Daemon build 1.0 alpha 26 protocol 10006
Chain chain1 already exists, adding 172.31.41.67:9543 to list of peers
Other nodes can connect to this node using:
multichaind chain1@172.31.22.80:9543
Node started

connect 2 nodes which are global

Tue, 28 Nov 2017 11:18:37 +0000

For e.g. One node is in NYC and other in Boston, what can I do to connect

I followed https://www.multichain.com/getting-started/ which helps me connect 2 nodes on same network

But if I try to connect nodes which are not in same network, than it shows me an error

Output:
MultiChain 1.0.2 Daemon (latest protocol 10009)

Retrieving blockchain parameters from the seed node 192.168.56.1:2693 ...
Error: Couldn't connect to the seed node 192.168.56.1 on port 2693 - please check multichaind is running at that address and that your firewall settings allow incoming connections.

Firewall issue when trying to connect second node to genesis node (both nodes are hosted on ubuntu vms)

Tue, 07 Nov 2017 14:20:24 +0000

Im trying to get a test mutlichain set up, that is literally get two nodes up and running but no matter what I do (firewall settings on both the host computers and within the linux os on the virtual machines I keep running into the following error.

cannot connect to the seed node IP:Port … make sure multichain is running at that address and firewall settings...

Does anyone have any suggestions as to how to get around it?

Is it becase im doing it on a VM, is a stand a lone box neccessary?

Can nodes on the same blockchain communicate behind firewalls or nats?

Tue, 27 Jun 2017 12:12:37 +0000

If I have one multichain node at my house behind my home router with an IP address of 192.168.x.x and I have another multichain node on the same blockchain at a friend's house behind his home router, will they be able to communicate with each other without having public static IP addresses?