I'm trying to set up a redis proxy to be http(s) compatible, and I've decided to use this docker image: serverless-redis-http

The configuration is pretty straight forward where you must only enter a couple of environment variables but it just does not work on railway's private network.

I know that railway private networks are IPv6, therefore I've set a corresponding service variable of the image to be compatible: SRH_IPV6=true
Additionally, in the SRH_CONNECTION_STRING I've set the URL to actually match the private network. After setting everything up, it responds with an error that it can't connect to redis database. Both services are on the same project.

However, when I change the URL to a public network (which I don't want to do because of egress fees) it works without any issues, so it must be related to railway.

I'm using redis-stack instead of normal redis, but this shouldn't cause any issues because as mentioned it worked on a public network. I've also tried to build the serverless-redis-http from scratch with some minor changes to enforce IPv6 but this didn't get me any results.

I've also tried to change the 'bind' redis setting to be more flexible - without results.

How can I fix it?

Thanks.