I am trying to scale up my application deployed on Heroku by increasing the 
number of dynos and am currently confronted with the issue of handling 
sessions in a distributed environment.

The regular solution (storing sessions in the database) does not seem to 
work anymore when multiple dynos run concurrently : clients get asked for 
login at every request.
I have no idea why this doesn't work since databases are supposed to be 
shared between dynos on Heroku, but as far as I know there are 2 possible 
ways to manage scalable sticky sessions:


   1. Memcache : couldn't use gluon/contrib to test this because the 
   MemcacheClient does not allow authentication in a connection string (i.e. 
   services like Memcached, MemCachier...)
   2. Redis : same issue --> Redis client does not seem to work well with 
   auth-based services that are available on Heroku (e.g. RedisCloud)
   


Any idea why db-based sessions do not stick out of the box on Heroku, 
and/or how to use a Cloud-based service to achieve session stickiness ?

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