Hey there, let's sort out this login issue you're having. AWS Marketplace's Neo4j Community Edition instances don't use the default neo4j/neo4j credentials—they generate a unique initial password instead. Here are reliable ways to get logged in or reset your password without disabling authentication:

Option 1: Retrieve the Auto-Generated Initial Password #

First, check the instance's initialization logs for the default password created during deployment:

1. SSH into your EC2 instance using your AWS key pair.
2. Run this command to pull the cloud-init logs:

   cat /var/log/cloud-init-output.log
   

3. Search through the log for keywords like "neo4j password" or just "password"—you'll find the auto-generated initial password here. Use this to log into the Neo4j browser.

Option 2: Reset the Neo4j Password Directly on the Instance #

If you can't find the initial password or it's no longer valid, you can reset it manually:

1. Stop the Neo4j service first:

   sudo systemctl stop neo4j
   

2. Start Neo4j in console mode with authentication temporarily disabled (this only affects this session, not the permanent config):

   sudo neo4j console --dbms.security.auth_enabled=false
   

3. Leave that terminal window open, and open a new SSH session to the same instance. Launch the Cypher shell:

   cypher-shell
   

   Press Enter when prompted for credentials—you'll log in without needing a password.
4. Run this Cypher command to set a new password (replace your-secure-new-password with your desired password):

   ALTER USER neo4j SET PASSWORD 'your-secure-new-password';
   

5. Exit the Cypher shell with :exit, then go back to the first terminal and press Ctrl+C to stop the console-mode Neo4j.
6. Restart the Neo4j service with the original authentication-enabled config:

   sudo systemctl start neo4j
   

7. Now you can log into the Neo4j browser using neo4j as the username and your new password.

Option 3: Verify Authentication Config (Double-Check) #

Just to make sure authentication is properly enabled (since you don't want to disable it):

1. Open the Neo4j config file:

   sudo nano /etc/neo4j/neo4j.conf
   

2. Look for the line dbms.security.auth_enabled—it should be set to true (this is the default, so it's likely already correct).
3. Save and exit the file, then restart Neo4j if you made any changes:

   sudo systemctl restart neo4j
   

内容的提问来源于stack exchange，提问作者Senthil