psycopg2 OperationalError: fatal: unsupported frontend protocol 1234.5679: server supports 2.0 to 3.0 - TypeScript

Introduction

This error message is related to psycopg2, a popular Python library for working with PostgreSQL databases. When connecting to a PostgreSQL server, psycopg2 sends a protocol version number to the server. If the server does not support the protocol version requested by the client, the connection attempt fails with this error.

Causes

This error can occur for several reasons. One possibility is that you are using an outdated version of psycopg2 that does not support the protocol version that your PostgreSQL server is using. Another possibility is that your PostgreSQL server has been configured to only allow certain protocol versions, and your client is requesting a version that is not supported.

Solutions

1. Update psycopg2: The first solution to try is to update your version of psycopg2 to the latest available version. This can be done using pip or your preferred package manager:

   pip install --upgrade psycopg2
   

2. Check PostgreSQL server settings: Check the PostgreSQL server settings to ensure that it is configured to allow the protocol version that your client is requesting. This can be done by modifying the pg_hba.conf and postgresql.conf configuration files.
3. Upgrade PostgreSQL server: If your PostgreSQL server is running an outdated version, consider upgrading it to a newer version that supports the protocol version you need.
4. Downgrade psycopg2: If none of the above solutions work and you are still experiencing the error, you may need to downgrade your version of psycopg2 to a version that is compatible with your PostgreSQL server.

Conclusion

If you encounter the psycopg2 OperationalError: fatal: unsupported frontend protocol 1234.5679: server supports 2.0 to 3.0 - TypeScript error, it may be due to an outdated or incompatible version of psycopg2 or a misconfiguration of your PostgreSQL server. Try updating your version of psycopg2 or checking your server settings, and if necessary, downgrading your psycopg2 version or upgrading your PostgreSQL server.