NetherNet is the new network protocol used by Minecraft: Bedrock Edition to communicate with servers. It is built on modern standards and replaces the old RakNet-based network protocol. This article explains what changes for servers in this transition.
This article is about the new network protocol for Minecraft: Bedrock Edition. For help with the connection error code "nethernet", refer to the list of error codes explained in the Minecraft help center.
Change your server port
The switch to NetherNet requires some changes in how you connect to your Aternos server. Namely, the port you use to connect changes from a random one to the default port 19132 and is the same for all servers. Anyone who added your server to their list before the change will have to edit it to change the port.
Players who do not update the port to 19132 will be unable to connect to the server.
Bedrock Dedicated
Bedrock Dedicated servers cannot use both the old and new protocols at the same time. Your server either only uses the old RakNet protocol or the new NetherNet protocol.
Version 26.50+
Minecraft 26.50 is the first version that supports NetherNet on Aternos. Servers on this version will still use the old protocol by default but allow you to switch to NetherNet in your server.properties file.
When switching to NetherNet, the port assigned to your server will change to 19132. If you decide to switch back from NetherNet to RakNet, your server will be assigned an entirely new random port, which will be different from the one you had before the change.
Version 26.60+
Minecraft 26.60 removes the old protocol entirely, so your server will be switched to the new protocol automatically. Using the old RakNet protocol is no longer possible in this version.
GeyserMC
GeyserMC does not support NetherNet yet. You can continue to connect through your existing server port using the old protocol.