Troubleshooting Streamlit's 'Please Wait' Issue on AWS EC2 Instance

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Have you spent hours trying to get your stunning Streamlit application up and running on an Amazon Web Services (AWS) Elastic Compute Cloud (EC2) instance, only to be greeted with a frustratingly cryptic 'Loading... Please wait...' message? You're not alone! In this article, we'll delve into the common pitfalls that may be causing this issue and provide actionable solutions to get your app accessible from anywhere.

### The Usual Suspects

Before diving headfirst into more complex configurations, let's cover some basic but often-overlooked factors:

1. Websocket Timing Out: Ensure that there are no issues with the WebSocket connection between your client browser and the EC2 instance hosting Streamlit. You can verify this by checking the console logs for any websocket-related errors.

### Advanced Troubleshooting Techniques

If you've ruled out the above basic causes, it's time to dig deeper into more advanced configuration options:

1. EC2 Security Group Rules: Double-check that your EC2 security group rules allow incoming traffic on port 8501 (the default port used by Streamlit). You can verify this using the AWS Management Console or via the `aws ec2 describe-security-groups` command in your terminal.

### Specific Workarounds

If you've exhausted all other options, try these specific workarounds:

1. Running Streamlit on Localhost with SSH Tunneling: One known workaround is to run Streamlit on localhost (`rverAddress='localhost'`) and then forward the necessary ports via an SSH tunnel from your local machine to the EC2 instance.

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After hours of debugging, you finally pinpointed the issue! In this article, we've covered some common causes for the 'Please wait...' screen in Streamlit on AWS EC2 instances. Remember that troubleshooting is often a process of elimination and patience – keep trying different combinations until your app finally loads as expected!

### Additional Resources

* 'Streamlit Documentation: Running on EC2'(https://streamlit.io/deployment/ec2)

* 'AWS Elastic Beanstalk User Guide: Setting up Websocket with Streamlit'(https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/tutorials/python-ec2.html#python-websockets-streamlit)

Hope this helps someone else save precious time and hair!

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