Moodle connection error after setup – possible Redis encryption in transit issue

After completing the Moodle™ installation wizard successfully, the next step was to update the value of the SSM Parameter IsMoodleSetupCompleted to 'Yes'.

However, after this step, Moodle is showing a connection error.

Error
Exception - read error on connection to moodlesession-dznqp5.serverless.apse1.cache.amazonaws.com:6379

I suspect the issue is related to the Redis configuration. I selected Redis Serverless, which has encryption in transit enabled by default. This may be causing the connection failure if Moodle isn't configured properly to use Redis with TLS.

Start with the Moodle installation wizard and the SSM Parameter IsMoodleSetupCompleted, then inspect the Redis Serverless configuration for encryption in transit and TLS support. Reproduce the connection error at moodlesession-dznqp5.serverless.apse1.cache.amazonaws.com:6379 and confirm that Moodle connects successfully after the configuration is corrected.

Written by the indexing model from the issue text.