Redis Connection Issues

Issue

Your app is no longer connecting to Redis and you are seeing errors relating to self-signed certificates.

Eg: <OpenSSL::SSL::SSLError: SSL_connect returned=1 errno=0 state=error: certificate verify failed (self signed certificate in certificate chain)> SSL_connect returned=1 errno=0 state=error: certificate verify failed (self signed certificate in certificate chain)

Resolution

Production plans (Premium and higher) of Heroku Data for Redis running Redis 6+ require TLS connections. Heroku Data for Redis uses self-signed certificates, which can require you to configure the verify_mode SSL setting of your Redis client.

To disable certificate verification, add { verify_mode: OpenSSL::SSL::VERIFY_NONE } (or your language equivalent) to your Redis connection configuration. We have example implementations for the following languages:

• Java
• Ruby
• Python
• Node.js
• Go
• PHP - Please note that in PHP { verify_mode: OpenSSL::SSL::VERIFY_NONE } is known as [verify_peer_name]. An example implementation is using ?ssl[verify_peer_name]=0&ssl[verify_peer]=0 with the latest Predis. More info on connecting in PHP.

See Connecting to Heroku Data for Redis for details and further examples on setting up TLS connections.