Can not connect to Redis over private network

[greg]

Ok. In which case … maybe this issue could be it?

The test is apparently to use the IPv4 of the Redis app (in place of redis.internal in the connection URL) and see if that works:

Connect to Redis app via internal network failing

Yes, <name>.internal:6379 is the right address. You might have to tweak your Node driver config to use that, though, I seem to remember Node drivers not looking for IPv6 addresses by default. You might need to pass this through to your connection code: 'family' : '6'