# RedisException: read error on connection to 127.0.0.1:6379 in /var/www/app/src/Cache/RedisCache.php:15

- **ID:** `php/redis-connection-read-error`
- **Domain:** php
- **Category:** network_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The Redis server closed the connection abruptly, often due to timeout settings, memory pressure, or network instability.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| PHP 8.1 | active | — | — |
| PHP 8.2 | active | — | — |
| PHP 8.3 | active | — | — |
| Redis 6.2 | active | — | — |
| Redis 7.0 | active | — | — |

## Workarounds

1. **Increase the Redis server's timeout setting (timeout 0) in redis.conf to prevent idle connections from being closed.** (85% success)
   ```
   Increase the Redis server's timeout setting (timeout 0) in redis.conf to prevent idle connections from being closed.
   ```
2. **Implement a retry mechanism in PHP with exponential backoff when a RedisException is caught.** (80% success)
   ```
   Implement a retry mechanism in PHP with exponential backoff when a RedisException is caught.
   ```

## Dead Ends

- **** — Increasing PHP's default_socket_timeout in php.ini does not affect Redis socket timeouts, which are handled separately. (90% fail)
- **** — Restarting only PHP-FPM without restarting Redis may not help if the Redis server itself is overloaded or has a high memory usage. (75% fail)
- **** — Disabling persistence (redis.persistent) may reduce the frequency but does not address the root cause of connection drops. (65% fail)