The Tool Desk
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To let Bedrock Edition players join a Java server through Geyser without owning a Java Edition account, install Floodgate 2.0, start it once so it creates key.pem, place that key where Geyser can read it, set auth-type: floodgate under Geyser’s remote: section, and restart. A proxy network also requires send-floodgate-data: true and the identical key on every backend.
The key is the trust link between Floodgate and Geyser. The filename, location, YAML indentation, software versions, and key consistency all matter; a single mismatch prevents authentication.
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Geyser translates Bedrock network traffic so a Bedrock client can connect to a Java server. By itself, Geyser normally expects Java-style authentication. Floodgate adds an authentication bridge that identifies Bedrock players without requiring them to sign in with a Java Edition account.
Floodgate 2.0 uses one generated key file, key.pem, as the shared trust credential. Floodgate creates the key the first time it successfully loads. Geyser must read a copy of that exact key, and its authentication mode must explicitly be set to Floodgate. If either side uses a different key, or if Geyser remains in another authentication mode, the Bedrock login is rejected.
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Before you begin
- Access to the server, proxy, or host panel that runs Geyser and Floodgate.
- A Floodgate 2.0 build compatible with your Geyser build. Floodgate 1.0 and 2.0 are not interchangeable.
- Permission to stop and start the relevant server and proxy processes.
- A way to edit Geyser’s active
config.ymlwithout changing YAML indentation. - A backup of existing Floodgate and Geyser configuration files, especially if you are migrating from version 1.0.
Decide where authentication is handled before installing anything. On a single server, Floodgate and Geyser may run together in the server’s plugin directory or as standalone components. On a proxy network, Floodgate may run on the proxy and the same trust key must be distributed to every backend that accepts the forwarded connection.
Understand the Floodgate 2.0 key layout
Floodgate 2.0 generates key.pem in its own configuration directory. On Spigot-, Paper-, or Bungee-style plugin installations, that directory is typically plugins/floodgate/. Standalone or other platforms can use a different configuration path, so use the directory created by your actual Floodgate installation rather than assuming the plugin path.
| Component | Expected item | Purpose |
|---|---|---|
| Floodgate 2.0 | key.pem |
Generated trust key used by Floodgate |
| Geyser Standalone | A copy of key.pem beside the Geyser jar and config.yml |
Allows Geyser to authenticate Bedrock connections through Floodgate |
| Geyser plugin build | A copy of key.pem in Geyser’s configuration folder |
Provides the same trust credential to the plugin |
| Proxy backend | The proxy’s exact key.pem copied into each backend Floodgate folder |
Keeps all servers in the network on one trust identity |
Floodgate 2.0 also keeps an older key as old-key.pem when replacing a previous installation. The active file for the 2.0 setup is the newly generated key.pem. Do not substitute old-key.pem unless a documented rollback procedure specifically requires it.
Install Floodgate 2.0 and generate the key
1. Install the matching Floodgate build
Install Floodgate 2.0 on the server or proxy that will perform Floodgate authentication. Keep the Floodgate and Geyser versions from the same current release family whenever possible. A Geyser build that worked with Floodgate 1.0 is not automatically compatible with Floodgate 2.0.
For a plugin installation, place the Floodgate plugin in the platform’s normal plugins directory. For a standalone or proxy installation, use that platform’s documented Floodgate deployment location. Do not copy a plugin into a standalone directory or treat a proxy installation as if it were a backend plugin.
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2. Start the process once
Start the server or proxy and wait until Floodgate reports a successful load. The first successful load creates its configuration and generates key.pem. Stop the process after the key has been generated if you need to copy the file before configuring Geyser.
If no key appears, read the startup log for a Floodgate loading error before continuing. Copying an empty, partial, or unrelated file will not establish trust.
3. Locate the generated file
Open Floodgate’s configuration folder and confirm that it contains key.pem. A common plugin path is plugins/floodgate/key.pem, but host panels and standalone deployments can place the folder elsewhere. Use the actual path shown by your platform and the files created by this Floodgate instance.
Floodgate 2.0 configuration includes a config-version entry. Its presence is a useful confirmation that the installation is using the newer configuration format rather than an untouched 1.0 setup.
Copy the key to Geyser
Geyser Standalone
Copy Floodgate’s active key.pem into the same directory as the Geyser Standalone jar and Geyser’s config.yml. The copy must be readable by the account that runs Geyser. Keep the filename exactly key.pem unless you intentionally change the corresponding key-file setting in Geyser’s configuration.
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Geyser as a server or proxy plugin
Copy key.pem into Geyser’s own configuration folder. Do not leave the only copy inside Floodgate’s folder if the two plugins use separate configuration directories; Geyser needs a readable copy in its active config location.
After copying, verify that the destination contains a real file rather than a shortcut, browser download, or text file with an extra extension such as key.pem.txt. Preserve the file’s contents byte for byte.
Set Geyser’s authentication mode
Open the config.yml that belongs to the Geyser instance handling Bedrock connections. Under the existing remote: section, set auth-type to the lowercase value floodgate:
remote:
auth-type: floodgateDo not create a second remote: block elsewhere in the file. Edit the existing block and retain its other settings, such as the Java server address and port. YAML uses spaces for nesting; the auth-type line must be indented beneath remote:.
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Check the key filename setting
Floodgate’s default key-file setting is key.pem. If your Geyser configuration specifies another filename, either rename the copied file to that exact name or change the setting back to key.pem. The name Geyser looks for and the name of the copied file must match exactly, including capitalization.
Restart and verify a single-server installation
- Save Geyser’s
config.yml. - Stop and start Geyser, or restart the host server if Geyser runs as a plugin.
- Read the startup log and confirm that Geyser loads without a missing-key or authentication-mode error.
- Connect from a Bedrock client using the server address and port exposed by Geyser.
- Confirm that the player reaches the Java server rather than being returned to the Bedrock server list with an authentication failure.
If the server has multiple Geyser instances, repeat the copy and configuration steps for each instance. A key present on one process does not automatically become available to another process.
Configure a proxy network
A proxy changes the trust path. The proxy receives the Bedrock connection, adds Floodgate data, and forwards the player to a backend. Every component that validates that data must use the same Floodgate key.
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Proxy settings
- Install and start Floodgate 2.0 on the proxy, allowing it to generate its active
key.pem. - Configure the proxy’s Geyser instance with
auth-type: floodgateunderremote:. - Set
send-floodgate-datatotruein the proxy configuration. - Restart the proxy after saving the configuration.
The relevant setting should read as a Boolean value, not a quoted word:
send-floodgate-data: trueBackend key distribution
- Copy the proxy’s active
key.peminto the Floodgate configuration folder on every backend server. - Replace older backend keys instead of adding a second file with a different name.
- Ensure each backend Geyser or Floodgate process points to the copied key according to its platform’s configuration layout.
- Restart every backend after the key is replaced.
All servers must use exactly the same key. Do not let each backend generate an independent key and expect the proxy to accept them; Floodgate rejects forwarded logins when the keys differ. If the proxy is regenerated or reinstalled and creates a new key, distribute that new proxy key to every backend before testing player connections again.
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| Network location | Key that must be used | Required setting |
|---|---|---|
| Proxy | Proxy-generated active key.pem |
auth-type: floodgate and send-floodgate-data: true |
| Backend A | Exact copy of the proxy key | Backend Floodgate/Geyser must read that key |
| Backend B and additional servers | Exact copy of the same proxy key | Use the same key, not a backend-specific replacement |
Resolve the key.pem and public-key.pem naming conflict
Floodgate-related documentation has used two names. Some older Geyser pages tell standalone users to copy public-key.pem, while Floodgate 2.0 guidance and other setup pages refer to key.pem. Floodgate 2.0’s single-key model uses the active key.pem generated in the Floodgate configuration folder.
For a new Floodgate 2.0 installation, use the file that Floodgate actually generated and reference the same filename in Geyser. Treat an instruction mentioning only public-key.pem as legacy guidance unless your installed Floodgate version genuinely creates that file and its current configuration explicitly expects it.
Do not rename a file merely to satisfy an old instruction without checking the installed file list and Geyser’s key-file setting. The important requirement is not the label alone; it is that Geyser reads the matching key material produced by the Floodgate 2.0 instance that authenticates the connection.
Migrate from Floodgate 1.0
Migration is a coordinated upgrade, not just a file swap. Floodgate 2.0 generates a new key on first load, keeps the previous key as old-key.pem, and uses one active key.pem instead of the two-key arrangement used by earlier versions.
- Back up the existing Floodgate and Geyser directories and note the current server or proxy topology.
- Stop Geyser, Floodgate, the proxy, and affected backends.
- Upgrade Geyser and every Floodgate server or proxy to versions that support Floodgate 2.0. Do not leave a 1.0 Floodgate process in the network.
- Start the primary Floodgate 2.0 instance once so it generates its new
key.pem. - Copy that active key to Geyser and, for a proxy network, to every backend Floodgate folder.
- Set
auth-type: floodgateand enablesend-floodgate-data: trueon the proxy when applicable. - Restart the proxy and all backends, then test a Bedrock login.
Builds of Geyser that worked with Floodgate 1.0 do not work with Floodgate 2.0. Updating only one side can produce missing-key, malformed-data, or key-mismatch errors even when the file appears to be in the right directory.
Protect the Floodgate key
Treat key.pem as a password. Possession of the key can allow Bedrock accounts to bypass Java Edition authentication through the trusted Floodgate path, so an exposed key can be used to cause harm to the server.
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- Never post the key in a support forum, chat message, screenshot, or public repository.
- Exclude it from backups that are uploaded to public storage and from source-control commits.
- Restrict filesystem permissions to the service accounts that run Floodgate and Geyser.
- Use a secure transfer method when copying the key between a proxy and backends.
- If you believe the key was exposed, stop the affected services, generate a replacement through the supported Floodgate procedure, distribute the new key to every trusted component, and restart the network.
Do not email a key to a host provider or paste it into a ticket unless that channel is explicitly secured and the provider is authorized to handle server credentials.
Troubleshooting common failures
| Symptom | Likely cause | Fix |
|---|---|---|
| Geyser says it cannot find the Floodgate key | Floodgate never loaded, the file is in the wrong directory, or the filename does not match | Start Floodgate once, confirm that its active key.pem exists, copy it into Geyser’s actual configuration location, and verify the configured key filename |
| Geyser starts but Bedrock users receive a Java-authentication error | auth-type is missing, outside the remote: block, or not lowercase |
Edit the active Geyser config.yml so it contains remote: followed by an indented auth-type: floodgate, then restart |
| Proxy log reports a key mismatch | A backend still has an older or independently generated key | Copy the proxy’s current key.pem to every backend Floodgate folder, replace the old file, and restart all affected services |
| Players can connect to the proxy but fail when sent to a backend | Floodgate data is not being forwarded or the backend cannot validate it | Set send-floodgate-data: true on the proxy and verify identical keys and compatible Floodgate versions on every backend |
| The copied file appears correct but is ignored | It was saved as key.pem.txt, placed in an inactive configuration directory, or the config points to another filename |
Show file extensions, inspect the process’s active config path, and make the configured filename and actual file name identical |
| The setup worked before an upgrade | Geyser and Floodgate are on incompatible 1.0/2.0 combinations, or a new key was generated | Upgrade Geyser and all Floodgate instances together, then redistribute the active 2.0 key |
| Configuration changes have no effect | The wrong config.yml was edited or the process was not restarted |
Identify the configuration directory used by the running Geyser instance, save the change there, and perform a full restart |
Validation checklist
Use this checklist before asking players to test:
- Floodgate reports a successful load and its directory contains an active
key.pem. - Geyser’s copy is in the correct standalone directory or plugin configuration folder.
- Geyser’s key-file setting matches the copied filename.
auth-type: floodgateis lowercase and nested underremote:.- The running process was restarted after the file and YAML changes.
- A proxy has
send-floodgate-data: true. - Every backend uses the proxy’s exact key rather than its own generated key.
- All Geyser and Floodgate components are on compatible 2.0-capable builds.
- The key is not present in public source control, logs, screenshots, or unsecured support messages.
What a successful login proves
When a Bedrock player reaches the Java server without a Java account prompt, Geyser is translating the connection, Floodgate is accepting the Bedrock identity, and the key shared by the participating components is valid. If the same player fails only after being transferred through a proxy, focus on forwarding and backend key consistency rather than changing the client’s account settings.
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