The WordPress Redis connection error is a problem that most site owners never encounter — because Redis is not a default WordPress component. If you are seeing it, your site is configured to use Redis as an object cache, and something has broken the connection between WordPress and the Redis server. The WordPress Redis connection error typically manifests as a site-breaking message in the WordPress admin dashboard or on the front end: "Error establishing a Redis connection" or a similar message from the Redis object cache plugin. Without the object cache working, WordPress either falls back to slower database queries for every cached request, or — depending on the plugin — it refuses to load at all until the WordPress Redis connection error is resolved. This guide covers every cause of the WordPress Redis connection error and the specific fix for each, including how to gracefully disable Redis if it cannot be made to work in your current environment.…